Fixed #12004 -- Improved error reporting when an abstract class is registered with the admin. Thanks to Matt Smalley for the report, and to mk and Julien Phalip for the patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15636 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/admin_registration/models.py

@@ -7,5 +7,9 @@ from django.db import models
 class Person(models.Model):
     name = models.CharField(max_length=200)
 
-class Place(models.Model):
+class Location(models.Model):
+    class Meta:
+        abstract = True
+
+class Place(Location):
     name = models.CharField(max_length=200)