Whitespace cleanup.

* Removed trailing whitespace.
* Added newline to EOF if missing.
* Removed blank lines at EOF.
* Removed some stray tabs.

tests/custom_managers_regress/tests.py

@@ -47,4 +47,3 @@ class CustomManagersRegressTestCase(TestCase):
         obj = RelatedModel.objects.get(name="xyzzy")
         obj.delete()
         self.assertEqual(len(OneToOneRestrictedModel.plain_manager.all()), 0)
-