import error when exporting page as Markdown format

I tried to export a page to text file via pandoc / Markdown.

__init__.py:118:get_module:ImportError: No module named markdown (pandoc)

Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/zim/gui/widgets.py", line 3176, in next_page
    return self.set_page(self._page + 1)
  File "/usr/lib/python2.7/site-packages/zim/gui/widgets.py", line 3154, in set_page
    page.init_uistate()
  File "/usr/lib/python2.7/site-packages/zim/gui/exportdialog.py", line 288, in init_uistate
    ext = zim.formats.get_format(self.uistate['format']).info['extension']
  File "/usr/lib/python2.7/site-packages/zim/formats/__init__.py", line 153, in get_format
    return get_format_module(name)
  File "/usr/lib/python2.7/site-packages/zim/formats/__init__.py", line 162, in get_format_module
    return zim.plugins.get_module('zim.formats', name)
  File "/usr/lib/python2.7/site-packages/zim/plugins/__init__.py", line 118, in get_module
    mod = __import__(modname)
ImportError: No module named markdown (pandoc)

Zim-0.56-1.fc16.noarch

And the crash happens between display 2/3 and 3/3 window.

It seems the name 'markdown (pandoc)' should be converted to 'markdown'.