[1.1.X] Expanded the fix in [12663] to cover CSS declarations, which were also...

[1.1.X] Expanded the fix in [12663] to cover CSS declarations, which were also affected by the bug. Refs #12879. Backport of [12665] from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.1.X@12666 bcc190cf-cafb-0310-a4f2-bffc1f526a37