Fixed #7421 -- Improved syncdb implementation not to check for exact exception...

Fixed #7421 -- Improved syncdb implementation not to check for exact exception text, in case of alternate Python implementation. Thanks, anto.cuni@gmail.com

git-svn-id: http://code.djangoproject.com/svn/django/trunk@7623 bcc190cf-cafb-0310-a4f2-bffc1f526a37