Fixed #15543 -- Tweaked change from r15696 to not use 'if' syntax introduce in...

Fixed #15543 -- Tweaked change from r15696 to not use 'if' syntax introduce in Python 2.5. Thanks to an anonymous reporter for the heads up.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15731 bcc190cf-cafb-0310-a4f2-bffc1f526a37