Fixed #11785 -- Clarified error message when the layer geometry type doesn't...

Fixed #11785 -- Clarified error message when the layer geometry type doesn't match the model field.  Thanks, esizikov for bug report and initial patch.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@12880 bcc190cf-cafb-0310-a4f2-bffc1f526a37