Fixed #2921: deserialization no longer failes on NULL primary keys.  Thanks, mir@noris.de.
Fixed #2921: deserialization no longer failes on NULL primary keys.  Thanks, mir@noris.de.

--HG--
extra : convert_revision : svn%3Abcc190cf-cafb-0310-a4f2-bffc1f526a37/django/trunk%404043

adieu/django-nonrel,adieu/django-nonrel,adieu/django-nonrel