To fix the devel env, you need to merge trunk and then "make distclean".

The following tests are all broken in your branch:

======================================================================
ERROR: maasserver.tests.test_preseed.TestPreseedMethods.test_get_preseed_returns_default_preseed
----------------------------------------------------------------------
_StringException: Traceback (most recent call last):
  File "/home/ed/canonical/maas/sandbox/src/maasserver/tests/test_preseed.py", line 525, in test_get_preseed_returns_default_preseed
    preseed = get_preseed(node)
  File "/home/ed/canonical/maas/sandbox/src/maasserver/preseed.py", line 80, in get_preseed
    release=node.get_distro_series())
  File "/home/ed/canonical/maas/sandbox/src/maasserver/preseed.py", line 306, in render_preseed
    return template.substitute(**context)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 177, in substitute
    result = self._interpret_inherit(result, defs, inherit, ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 204, in _interpret_inherit
    return templ.substitute(ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 173, in substitute
    result, defs, inherit = self._interpret(ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 184, in _interpret
    self._interpret_codes(self._parsed, ns, out=parts, defs=defs)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 212, in _interpret_codes
    self._interpret_code(item, ns, out, defs)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 218, in _interpret_code
    self._exec(code[2], ns, pos)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 312, in _exec
    exec code in self.default_namespace, ns
  File "<string>", line 12, in <module>
TypeError: coercing to Unicode: need string or buffer, NoneType found at line 1 column 3 in file /home/ed/canonical/maas/sandbox/contrib/preseeds_v2/preseed_xinstall


======================================================================
ERROR: maasserver.tests.test_preseed.TestPreseedProxy.test_preseed_uses_configured_proxy
----------------------------------------------------------------------
_StringException: Traceback (most recent call last):
  File "/home/ed/canonical/maas/sandbox/src/maasserver/tests/test_preseed.py", line 513, in test_preseed_uses_configured_proxy
    factory.make_node(), PRESEED_TYPE.DEFAULT, "precise")
  File "/home/ed/canonical/maas/sandbox/src/maasserver/preseed.py", line 306, in render_preseed
    return template.substitute(**context)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 177, in substitute
    result = self._interpret_inherit(result, defs, inherit, ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 204, in _interpret_inherit
    return templ.substitute(ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 173, in substitute
    result, defs, inherit = self._interpret(ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 184, in _interpret
    self._interpret_codes(self._parsed, ns, out=parts, defs=defs)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 212, in _interpret_codes
    self._interpret_code(item, ns, out, defs)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 218, in _interpret_code
    self._exec(code[2], ns, pos)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 312, in _exec
    exec code in self.default_namespace, ns
  File "<string>", line 12, in <module>
TypeError: coercing to Unicode: need string or buffer, NoneType found at line 1 column 3 in file /home/ed/canonical/maas/sandbox/contrib/preseeds_v2/preseed_xinstall


======================================================================
ERROR: maasserver.tests.test_preseed.TestPreseedProxy.test_preseed_uses_default_proxy
----------------------------------------------------------------------
_StringException: Traceback (most recent call last):
  File "/home/ed/canonical/maas/sandbox/src/maasserver/tests/test_preseed.py", line 502, in test_preseed_uses_default_proxy
    factory.make_node(), PRESEED_TYPE.DEFAULT, "precise")
  File "/home/ed/canonical/maas/sandbox/src/maasserver/preseed.py", line 306, in render_preseed
    return template.substitute(**context)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 177, in substitute
    result = self._interpret_inherit(result, defs, inherit, ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 204, in _interpret_inherit
    return templ.substitute(ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 173, in substitute
    result, defs, inherit = self._interpret(ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 184, in _interpret
    self._interpret_codes(self._parsed, ns, out=parts, defs=defs)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 212, in _interpret_codes
    self._interpret_code(item, ns, out, defs)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 218, in _interpret_code
    self._exec(code[2], ns, pos)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 312, in _exec
    exec code in self.default_namespace, ns
  File "<string>", line 12, in <module>
TypeError: coercing to Unicode: need string or buffer, NoneType found at line 1 column 3 in file /home/ed/canonical/maas/sandbox/contrib/preseeds_v2/preseed_xinstall


======================================================================
ERROR: maasserver.tests.test_preseed.TestPreseedURLs.test_compose_preseed_url_links_to_preseed_for_node
----------------------------------------------------------------------
_StringException: Traceback (most recent call last):
  File "/home/ed/canonical/maas/sandbox/src/maasserver/tests/test_preseed.py", line 557, in test_compose_preseed_url_links_to_preseed_for_node
    (httplib.OK, get_preseed(node)),
  File "/home/ed/canonical/maas/sandbox/src/maasserver/preseed.py", line 80, in get_preseed
    release=node.get_distro_series())
  File "/home/ed/canonical/maas/sandbox/src/maasserver/preseed.py", line 306, in render_preseed
    return template.substitute(**context)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 177, in substitute
    result = self._interpret_inherit(result, defs, inherit, ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 204, in _interpret_inherit
    return templ.substitute(ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 173, in substitute
    result, defs, inherit = self._interpret(ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 184, in _interpret
    self._interpret_codes(self._parsed, ns, out=parts, defs=defs)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 212, in _interpret_codes
    self._interpret_code(item, ns, out, defs)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 218, in _interpret_code
    self._exec(code[2], ns, pos)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 312, in _exec
    exec code in self.default_namespace, ns
  File "<string>", line 12, in <module>
TypeError: coercing to Unicode: need string or buffer, NoneType found at line 1 column 3 in file /home/ed/canonical/maas/sandbox/contrib/preseeds_v2/preseed_xinstall


======================================================================
ERROR: maasserver.tests.test_preseed.TestRenderPreseed.test_get_preseed_uses_nodegroup_maas_url
----------------------------------------------------------------------
_StringException: Traceback (most recent call last):
  File "/home/ed/canonical/maas/sandbox/src/maasserver/tests/test_preseed.py", line 441, in test_get_preseed_uses_nodegroup_maas_url
    preseed = render_preseed(node, self.preseed, "precise")
  File "/home/ed/canonical/maas/sandbox/src/maasserver/preseed.py", line 306, in render_preseed
    return template.substitute(**context)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 177, in substitute
    result = self._interpret_inherit(result, defs, inherit, ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 204, in _interpret_inherit
    return templ.substitute(ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 173, in substitute
    result, defs, inherit = self._interpret(ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 184, in _interpret
    self._interpret_codes(self._parsed, ns, out=parts, defs=defs)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 212, in _interpret_codes
    self._interpret_code(item, ns, out, defs)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 218, in _interpret_code
    self._exec(code[2], ns, pos)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 312, in _exec
    exec code in self.default_namespace, ns
  File "<string>", line 12, in <module>
TypeError: coercing to Unicode: need string or buffer, NoneType found at line 1 column 3 in file /home/ed/canonical/maas/sandbox/contrib/preseeds_v2/preseed_xinstall


======================================================================
ERROR: maasserver.tests.test_preseed.TestRenderPreseed.test_render_preseed
----------------------------------------------------------------------
_StringException: Traceback (most recent call last):
  File "/home/ed/canonical/maas/sandbox/src/maasserver/tests/test_preseed.py", line 429, in test_render_preseed
    preseed = render_preseed(node, self.preseed, "precise")
  File "/home/ed/canonical/maas/sandbox/src/maasserver/preseed.py", line 306, in render_preseed
    return template.substitute(**context)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 177, in substitute
    result = self._interpret_inherit(result, defs, inherit, ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 204, in _interpret_inherit
    return templ.substitute(ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 173, in substitute
    result, defs, inherit = self._interpret(ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 184, in _interpret
    self._interpret_codes(self._parsed, ns, out=parts, defs=defs)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 212, in _interpret_codes
    self._interpret_code(item, ns, out, defs)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 218, in _interpret_code
    self._exec(code[2], ns, pos)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 312, in _exec
    exec code in self.default_namespace, ns
  File "<string>", line 12, in <module>
TypeError: coercing to Unicode: need string or buffer, NoneType found at line 1 column 3 in file /home/ed/canonical/maas/sandbox/contrib/preseeds_v2/preseed_xinstall


======================================================================
ERROR: maasserver.tests.test_preseed.TestRenderPreseedArchives.test_render_preseed_uses_default_archives_arm
----------------------------------------------------------------------
_StringException: Traceback (most recent call last):
  File "/home/ed/canonical/maas/sandbox/src/maasserver/tests/test_preseed.py", line 488, in test_render_preseed_uses_default_archives_arm
    preseed = render_preseed(node, PRESEED_TYPE.DEFAULT, "precise")
  File "/home/ed/canonical/maas/sandbox/src/maasserver/preseed.py", line 306, in render_preseed
    return template.substitute(**context)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 177, in substitute
    result = self._interpret_inherit(result, defs, inherit, ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 204, in _interpret_inherit
    return templ.substitute(ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 173, in substitute
    result, defs, inherit = self._interpret(ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 184, in _interpret
    self._interpret_codes(self._parsed, ns, out=parts, defs=defs)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 212, in _interpret_codes
    self._interpret_code(item, ns, out, defs)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 218, in _interpret_code
    self._exec(code[2], ns, pos)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 312, in _exec
    exec code in self.default_namespace, ns
  File "<string>", line 12, in <module>
TypeError: coercing to Unicode: need string or buffer, NoneType found at line 1 column 3 in file /home/ed/canonical/maas/sandbox/contrib/preseeds_v2/preseed_xinstall


======================================================================
ERROR: maasserver.tests.test_preseed.TestRenderPreseedArchives.test_render_preseed_uses_default_archives_intel
----------------------------------------------------------------------
_StringException: Traceback (most recent call last):
  File "/home/ed/canonical/maas/sandbox/src/maasserver/tests/test_preseed.py", line 479, in test_render_preseed_uses_default_archives_intel
    preseed = render_preseed(node, PRESEED_TYPE.DEFAULT, "precise")
  File "/home/ed/canonical/maas/sandbox/src/maasserver/preseed.py", line 306, in render_preseed
    return template.substitute(**context)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 177, in substitute
    result = self._interpret_inherit(result, defs, inherit, ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 204, in _interpret_inherit
    return templ.substitute(ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 173, in substitute
    result, defs, inherit = self._interpret(ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 184, in _interpret
    self._interpret_codes(self._parsed, ns, out=parts, defs=defs)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 212, in _interpret_codes
    self._interpret_code(item, ns, out, defs)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 218, in _interpret_code
    self._exec(code[2], ns, pos)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 312, in _exec
    exec code in self.default_namespace, ns
  File "<string>", line 12, in <module>
TypeError: coercing to Unicode: need string or buffer, NoneType found at line 1 column 3 in file /home/ed/canonical/maas/sandbox/contrib/preseeds_v2/preseed_xinstall


======================================================================
ERROR: maasserver.tests.test_views_nodes.NodePreseedViewTest.test_preseedview_node_displays_link_to_view_node
----------------------------------------------------------------------
_StringException: Traceback (most recent call last):
  File "/home/ed/canonical/maas/sandbox/src/maasserver/tests/test_views_nodes.py", line 694, in test_preseedview_node_displays_link_to_view_node
    response = self.client.get(node_preseed_link)
  File "/usr/lib/python2.7/dist-packages/django/test/client.py", line 439, in get
    response = super(Client, self).get(path, data=data, **extra)
  File "/usr/lib/python2.7/dist-packages/django/test/client.py", line 244, in get
    return self.request(**r)
  File "/usr/lib/python2.7/dist-packages/django/core/handlers/base.py", line 111, in get_response
    response = callback(request, *callback_args, **callback_kwargs)
  File "/usr/lib/python2.7/dist-packages/django/views/generic/base.py", line 48, in view
    return self.dispatch(request, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/django/views/generic/base.py", line 69, in dispatch
    return handler(request, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/django/views/generic/detail.py", line 99, in get
    context = self.get_context_data(object=self.object)
  File "/home/ed/canonical/maas/sandbox/src/maasserver/views/nodes.py", line 222, in get_context_data
    context['preseed'] = mark_safe(get_preseed(node))
  File "/home/ed/canonical/maas/sandbox/src/maasserver/preseed.py", line 80, in get_preseed
    release=node.get_distro_series())
  File "/home/ed/canonical/maas/sandbox/src/maasserver/preseed.py", line 306, in render_preseed
    return template.substitute(**context)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 177, in substitute
    result = self._interpret_inherit(result, defs, inherit, ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 204, in _interpret_inherit
    return templ.substitute(ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 173, in substitute
    result, defs, inherit = self._interpret(ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 184, in _interpret
    self._interpret_codes(self._parsed, ns, out=parts, defs=defs)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 212, in _interpret_codes
    self._interpret_code(item, ns, out, defs)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 218, in _interpret_code
    self._exec(code[2], ns, pos)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 312, in _exec
    exec code in self.default_namespace, ns
  File "<string>", line 12, in <module>
TypeError: coercing to Unicode: need string or buffer, NoneType found at line 1 column 3 in file /home/ed/canonical/maas/sandbox/contrib/preseeds_v2/preseed_xinstall

-------------------- >> begin captured logging << --------------------
maas.maasserver: ERROR: ################################ Exception: coercing to Unicode: need string or buffer, NoneType found at line 1 column 3 in file /home/ed/canonical/maas/sandbox/contrib/preseeds_v2/preseed_xinstall ################################
maas.maasserver: ERROR: Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/django/core/handlers/base.py", line 111, in get_response
    response = callback(request, *callback_args, **callback_kwargs)
  File "/usr/lib/python2.7/dist-packages/django/views/generic/base.py", line 48, in view
    return self.dispatch(request, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/django/views/generic/base.py", line 69, in dispatch
    return handler(request, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/django/views/generic/detail.py", line 99, in get
    context = self.get_context_data(object=self.object)
  File "/home/ed/canonical/maas/sandbox/src/maasserver/views/nodes.py", line 222, in get_context_data
    context['preseed'] = mark_safe(get_preseed(node))
  File "/home/ed/canonical/maas/sandbox/src/maasserver/preseed.py", line 80, in get_preseed
    release=node.get_distro_series())
  File "/home/ed/canonical/maas/sandbox/src/maasserver/preseed.py", line 306, in render_preseed
    return template.substitute(**context)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 177, in substitute
    result = self._interpret_inherit(result, defs, inherit, ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 204, in _interpret_inherit
    return templ.substitute(ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 173, in substitute
    result, defs, inherit = self._interpret(ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 184, in _interpret
    self._interpret_codes(self._parsed, ns, out=parts, defs=defs)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 212, in _interpret_codes
    self._interpret_code(item, ns, out, defs)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 218, in _interpret_code
    self._exec(code[2], ns, pos)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 312, in _exec
    exec code in self.default_namespace, ns
  File "<string>", line 12, in <module>
TypeError: coercing to Unicode: need string or buffer, NoneType found at line 1 column 3 in file /home/ed/canonical/maas/sandbox/contrib/preseeds_v2/preseed_xinstall

django.request: ERROR: Internal Server Error: /nodes/node-7ba93558-a7f3-11e2-8b9a-002215205ce8/preseedview/
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/django/core/handlers/base.py", line 111, in get_response
    response = callback(request, *callback_args, **callback_kwargs)
  File "/usr/lib/python2.7/dist-packages/django/views/generic/base.py", line 48, in view
    return self.dispatch(request, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/django/views/generic/base.py", line 69, in dispatch
    return handler(request, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/django/views/generic/detail.py", line 99, in get
    context = self.get_context_data(object=self.object)
  File "/home/ed/canonical/maas/sandbox/src/maasserver/views/nodes.py", line 222, in get_context_data
    context['preseed'] = mark_safe(get_preseed(node))
  File "/home/ed/canonical/maas/sandbox/src/maasserver/preseed.py", line 80, in get_preseed
    release=node.get_distro_series())
  File "/home/ed/canonical/maas/sandbox/src/maasserver/preseed.py", line 306, in render_preseed
    return template.substitute(**context)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 177, in substitute
    result = self._interpret_inherit(result, defs, inherit, ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 204, in _interpret_inherit
    return templ.substitute(ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 173, in substitute
    result, defs, inherit = self._interpret(ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 184, in _interpret
    self._interpret_codes(self._parsed, ns, out=parts, defs=defs)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 212, in _interpret_codes
    self._interpret_code(item, ns, out, defs)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 218, in _interpret_code
    self._exec(code[2], ns, pos)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 312, in _exec
    exec code in self.default_namespace, ns
  File "<string>", line 12, in <module>
TypeError: coercing to Unicode: need string or buffer, NoneType found at line 1 column 3 in file /home/ed/canonical/maas/sandbox/contrib/preseeds_v2/preseed_xinstall
--------------------- >> end captured logging << ---------------------

======================================================================
ERROR: maasserver.tests.test_views_nodes.NodePreseedViewTest.test_preseedview_node_displays_preseed_data
----------------------------------------------------------------------
_StringException: Traceback (most recent call last):
  File "/home/ed/canonical/maas/sandbox/src/maasserver/tests/test_views_nodes.py", line 678, in test_preseedview_node_displays_preseed_data
    response = self.client.get(node_preseed_link)
  File "/usr/lib/python2.7/dist-packages/django/test/client.py", line 439, in get
    response = super(Client, self).get(path, data=data, **extra)
  File "/usr/lib/python2.7/dist-packages/django/test/client.py", line 244, in get
    return self.request(**r)
  File "/usr/lib/python2.7/dist-packages/django/core/handlers/base.py", line 111, in get_response
    response = callback(request, *callback_args, **callback_kwargs)
  File "/usr/lib/python2.7/dist-packages/django/views/generic/base.py", line 48, in view
    return self.dispatch(request, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/django/views/generic/base.py", line 69, in dispatch
    return handler(request, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/django/views/generic/detail.py", line 99, in get
    context = self.get_context_data(object=self.object)
  File "/home/ed/canonical/maas/sandbox/src/maasserver/views/nodes.py", line 222, in get_context_data
    context['preseed'] = mark_safe(get_preseed(node))
  File "/home/ed/canonical/maas/sandbox/src/maasserver/preseed.py", line 80, in get_preseed
    release=node.get_distro_series())
  File "/home/ed/canonical/maas/sandbox/src/maasserver/preseed.py", line 306, in render_preseed
    return template.substitute(**context)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 177, in substitute
    result = self._interpret_inherit(result, defs, inherit, ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 204, in _interpret_inherit
    return templ.substitute(ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 173, in substitute
    result, defs, inherit = self._interpret(ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 184, in _interpret
    self._interpret_codes(self._parsed, ns, out=parts, defs=defs)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 212, in _interpret_codes
    self._interpret_code(item, ns, out, defs)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 218, in _interpret_code
    self._exec(code[2], ns, pos)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 312, in _exec
    exec code in self.default_namespace, ns
  File "<string>", line 12, in <module>
TypeError: coercing to Unicode: need string or buffer, NoneType found at line 1 column 3 in file /home/ed/canonical/maas/sandbox/contrib/preseeds_v2/preseed_xinstall

-------------------- >> begin captured logging << --------------------
maas.maasserver: ERROR: ################################ Exception: coercing to Unicode: need string or buffer, NoneType found at line 1 column 3 in file /home/ed/canonical/maas/sandbox/contrib/preseeds_v2/preseed_xinstall ################################
maas.maasserver: ERROR: Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/django/core/handlers/base.py", line 111, in get_response
    response = callback(request, *callback_args, **callback_kwargs)
  File "/usr/lib/python2.7/dist-packages/django/views/generic/base.py", line 48, in view
    return self.dispatch(request, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/django/views/generic/base.py", line 69, in dispatch
    return handler(request, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/django/views/generic/detail.py", line 99, in get
    context = self.get_context_data(object=self.object)
  File "/home/ed/canonical/maas/sandbox/src/maasserver/views/nodes.py", line 222, in get_context_data
    context['preseed'] = mark_safe(get_preseed(node))
  File "/home/ed/canonical/maas/sandbox/src/maasserver/preseed.py", line 80, in get_preseed
    release=node.get_distro_series())
  File "/home/ed/canonical/maas/sandbox/src/maasserver/preseed.py", line 306, in render_preseed
    return template.substitute(**context)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 177, in substitute
    result = self._interpret_inherit(result, defs, inherit, ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 204, in _interpret_inherit
    return templ.substitute(ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 173, in substitute
    result, defs, inherit = self._interpret(ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 184, in _interpret
    self._interpret_codes(self._parsed, ns, out=parts, defs=defs)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 212, in _interpret_codes
    self._interpret_code(item, ns, out, defs)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 218, in _interpret_code
    self._exec(code[2], ns, pos)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 312, in _exec
    exec code in self.default_namespace, ns
  File "<string>", line 12, in <module>
TypeError: coercing to Unicode: need string or buffer, NoneType found at line 1 column 3 in file /home/ed/canonical/maas/sandbox/contrib/preseeds_v2/preseed_xinstall

django.request: ERROR: Internal Server Error: /nodes/node-7c424fd6-a7f3-11e2-8b9a-002215205ce8/preseedview/
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/django/core/handlers/base.py", line 111, in get_response
    response = callback(request, *callback_args, **callback_kwargs)
  File "/usr/lib/python2.7/dist-packages/django/views/generic/base.py", line 48, in view
    return self.dispatch(request, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/django/views/generic/base.py", line 69, in dispatch
    return handler(request, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/django/views/generic/detail.py", line 99, in get
    context = self.get_context_data(object=self.object)
  File "/home/ed/canonical/maas/sandbox/src/maasserver/views/nodes.py", line 222, in get_context_data
    context['preseed'] = mark_safe(get_preseed(node))
  File "/home/ed/canonical/maas/sandbox/src/maasserver/preseed.py", line 80, in get_preseed
    release=node.get_distro_series())
  File "/home/ed/canonical/maas/sandbox/src/maasserver/preseed.py", line 306, in render_preseed
    return template.substitute(**context)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 177, in substitute
    result = self._interpret_inherit(result, defs, inherit, ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 204, in _interpret_inherit
    return templ.substitute(ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 173, in substitute
    result, defs, inherit = self._interpret(ns)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 184, in _interpret
    self._interpret_codes(self._parsed, ns, out=parts, defs=defs)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 212, in _interpret_codes
    self._interpret_code(item, ns, out, defs)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 218, in _interpret_code
    self._exec(code[2], ns, pos)
  File "/usr/lib/python2.7/dist-packages/tempita/__init__.py", line 312, in _exec
    exec code in self.default_namespace, ns
  File "<string>", line 12, in <module>
TypeError: coercing to Unicode: need string or buffer, NoneType found at line 1 column 3 in file /home/ed/canonical/maas/sandbox/contrib/preseeds_v2/preseed_xinstall
--------------------- >> end captured logging << ---------------------

======================================================================
FAIL: maasserver.tests.test_preseed.TestPreseedContext.test_preseed_context_null_cluster_host_if_unmanaged
----------------------------------------------------------------------
_StringException: Traceback (most recent call last):
  File "/home/ed/canonical/maas/sandbox/src/maasserver/tests/test_preseed.py", line 381, in test_preseed_context_null_cluster_host_if_unmanaged
    self.assertIsNone(context["cluster_host"])
MismatchError: None is not '181.71.90.77'

======================================================================
ERROR: provisioningserver.pxe.tests.test_install_image.TestInstallPXEImage.test_install_dir_moves_dir_into_place
----------------------------------------------------------------------
_StringException: Traceback (most recent call last):
  File "/home/ed/canonical/maas/sandbox/src/provisioningserver/pxe/tests/test_install_image.py", line 159, in test_install_dir_moves_dir_into_place
    install_dir(download_image, published_image)
TypeError: install_dir() takes exactly 3 arguments (2 given)


======================================================================
ERROR: provisioningserver.pxe.tests.test_install_image.TestInstallPXEImage.test_install_dir_normalises_permissions
----------------------------------------------------------------------
_StringException: Traceback (most recent call last):
  File "/home/ed/canonical/maas/sandbox/src/provisioningserver/pxe/tests/test_install_image.py", line 205, in test_install_dir_normalises_permissions
    install_dir(new_dir.path, target_dir.path)
TypeError: install_dir() takes exactly 3 arguments (2 given)


======================================================================
ERROR: provisioningserver.pxe.tests.test_install_image.TestInstallPXEImage.test_install_dir_replaces_existing_dir
----------------------------------------------------------------------
_StringException: Traceback (most recent call last):
  File "/home/ed/canonical/maas/sandbox/src/provisioningserver/pxe/tests/test_install_image.py", line 171, in test_install_dir_replaces_existing_dir
    install_dir(download_image, published_image)
TypeError: install_dir() takes exactly 3 arguments (2 given)


======================================================================
ERROR: provisioningserver.pxe.tests.test_install_image.TestInstallPXEImage.test_install_dir_sweeps_aside_dot_new_and_dot_old_if_any
----------------------------------------------------------------------
_StringException: Traceback (most recent call last):
  File "/home/ed/canonical/maas/sandbox/src/provisioningserver/pxe/tests/test_install_image.py", line 189, in test_install_dir_sweeps_aside_dot_new_and_dot_old_if_any
    install_dir(download_image, published_image)
TypeError: install_dir() takes exactly 3 arguments (2 given)