[django/django] 6bdc47: Use a more explicit check for whether these ids ar...

[GitHub]

Branch: refs/heads/master
Home: https://github.com/django/django
Commit: 6bdc47f75ca31d607653eebee3a144631df46aae
https://github.com/django/django/commit/6bdc47f75ca31d607653eebee3a144631df46aae
Author: Alex Gaynor <alex....@gmail.com>
Date: 2013-07-07 (Sun, 07 Jul 2013)

Changed paths:
M django/contrib/contenttypes/generic.py

Log Message:
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Use a more explicit check for whether these ids are None.