[1.0.X] Fixed #5753 -- Allow createsuperuser to work in situations where there

might be a valid password database entry for the current user id.

Backport of r9158 from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@9159 bcc190cf-cafb-0310-a4f2-bffc1f526a37