[1.2.X] Fixed #14366 -- Model.objects.none().values() now correctly returns a...

[1.2.X] Fixed #14366 -- Model.objects.none().values() now correctly returns a QuerySet with no items, rather than raising an Exception.  Thanks to Carl Meyer for the patch.  Backport of [14084].

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@14085 bcc190cf-cafb-0310-a4f2-bffc1f526a37