[1.7.x] Fixed flake8 errors.

Backport of 4b25ebf112 from master

django/db/backends/creation.py

@@ -412,6 +412,7 @@ class BaseDatabaseCreation(object):
                 app_config.name not in settings.TEST_NON_SERIALIZED_APPS
             ):
                 app_list.append((app_config, None))
+
         # Make a function to iteratively return every object
         def get_objects():
             for model in sort_dependencies(app_list):

django/test/testcases.py

@@ -842,7 +842,6 @@ 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: