Further clarifying the message when get_queryset returns None to include the…

Further clarifying the message when get_queryset returns None to include the class name that was called

rest_framework/permissions.py

@@ -123,7 +123,7 @@ class DjangoModelPermissions(BasePermission):
         if hasattr(view, 'get_queryset'):
             queryset = view.get_queryset()
             assert queryset is not None, (
-                'The `.get_queryset()` method from the view did not return anything.'
+                'Return of {}.get_queryset() was None'.format(view.__class__.__name__)
             )
         else:
             queryset = getattr(view, 'queryset', None)