[django/django] 063e7e: [1.7.x] Fixed flake8 warnings.

[GitHub]

Branch: refs/heads/stable/1.7.x
Home: https://github.com/django/django
Commit: 063e7e56bcd34d76e9072ebfa3b9f1d9679dc6e9
https://github.com/django/django/commit/063e7e56bcd34d76e9072ebfa3b9f1d9679dc6e9
Author: Tim Graham <timog...@gmail.com>
Date: 2014-07-31 (Thu, 31 Jul 2014)

Changed paths:
M django/db/migrations/autodetector.py
M tests/model_fields/models.py

Log Message:
-----------
[1.7.x] Fixed flake8 warnings.

Backport of 9a922dcad1 from master