Code review comment for lp:~blake-rouse/maas/add-osystem-to-node-migration

[0]

As Jason pointed out, it's always best to land tests with the code they test. For new models, a basic test is enough. You also might want to add a make_<my_model> utility in the test factory (src/maasserver/testing/factory.py)

[1]

See my inline comment about using null=True on Charfields.

[2]

As Jason pointed out, don't forget to run:
$ ./utilities/format-new-and-modified-imports
and
$ make lint
before you submit a branch.

[3]

Please update the Node's docstring.