PEP8 updates.

mayan/apps/common/tests/test_views.py

@@ -1,7 +1,6 @@
 from __future__ import unicode_literals
 
 from django.contrib.auth.models import User
-from django.core.files import File
 from django.core.urlresolvers import reverse
 from django.test.client import Client
 from django.test import TestCase