PEP8 cleanups

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/documents/views/document_version_views.py

@@ -3,10 +3,8 @@ from __future__ import absolute_import, unicode_literals
 import logging
 
 from django.contrib import messages
-from django.shortcuts import get_object_or_404
 from django.utils.translation import ugettext_lazy as _
 
-from mayan.apps.acls.models import AccessControlList
 from mayan.apps.common.generics import (
     ConfirmView, SingleObjectDetailView, SingleObjectListView
 )