Fixed a small collection of flake8 violations that had snuck in

django/db/models/fields/related.py

@@ -18,7 +18,6 @@ from django.utils.deprecation import RenameMethodsBase
 from django.utils.translation import ugettext_lazy as _
 from django.utils.functional import curry, cached_property
 from django.core import exceptions
-from django.apps import apps
 from django import forms
 
 RECURSIVE_RELATIONSHIP_CONSTANT = 'self'

tests/migrations/test_state.py

@@ -35,6 +35,7 @@ class StateTests(TestCase):
 
         class SubAuthor(Author):
             width = models.FloatField(null=True)
+
             class Meta:
                 app_label = "migrations"
                 apps = new_apps