Fixed #6752 -- Corrected the interaction of the safe template filter with...

Fixed #6752 -- Corrected the interaction of the safe template filter with other filters. Thanks to Rupe and Alex Gaynor for their work on the patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@13171 bcc190cf-cafb-0310-a4f2-bffc1f526a37