[1.0.X] Fixed #9474: user_passes_test may now be applied multiple times....

[1.0.X] Fixed #9474: user_passes_test may now be applied multiple times. Backport of r10328 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@10329 bcc190cf-cafb-0310-a4f2-bffc1f526a37