[1.1.X] Fixed #6752 -- Corrected the interaction of the safe template filter...

[1.1.X] 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.

Backport of r13171 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.1.X@13177 bcc190cf-cafb-0310-a4f2-bffc1f526a37