alex/django-filter — pull request #128 by asafge (2013-12-12 15:04:24+00:00)
Title: Fixed a case where MultipleChoiceFilter returns all results by mistake

In case the choices field is not required (null=True, blank=True on the model), there's no way to get all items that has *some* choice. My change removes the "get all" optimization but supports this use-case.