[1.1.X] Fixed #12734. Deferred fields will now be properly converted to python...

[1.1.X] Fixed #12734. Deferred fields will now be properly converted to python when accessed. Backport of r12579 from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.1.X@12692 bcc190cf-cafb-0310-a4f2-bffc1f526a37