Fixed flake8 error.

django/test/testcases.py

@@ -868,7 +868,6 @@ class TransactionTestCase(SimpleTestCase):
                          allow_cascade=self.available_apps is not None,
                          inhibit_post_migrate=self.available_apps is not None)
 
-
     def assertQuerysetEqual(self, qs, values, transform=repr, ordered=True, msg=None):
         items = six.moves.map(transform, qs)
         if not ordered: