[1.1.X] Fixed #12070. Fixed a case where var._whatever wasn't raising a...

[1.1.X] Fixed #12070. Fixed a case where var._whatever wasn't raising a TemplateSyntaxError. Backport of r12539 from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.1.X@12540 bcc190cf-cafb-0310-a4f2-bffc1f526a37