Ticket #11160: formset_non_form_errors.diff

django/forms/formsets.py

@@ -199 +199 @@
         form -- i.e., from formset.clean(). Returns an empty ErrorList if there
         are none.
         """
+        if self._non_form_errors is None:
+            self.full_clean()
         if self._non_form_errors is not None:
             return self._non_form_errors
         return self.error_class()