Fixed #7421 -- Corrected the condition used during syncdb to establish that a...

Fixed #7421 -- Corrected the condition used during syncdb to establish that a management module is or isn't available. This is to satisfy non-CPython implementations which can use different error messages. Thanks to Maciej Fijalkowski (fijal) for his help confirming the problem.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@7891 bcc190cf-cafb-0310-a4f2-bffc1f526a37