[imp] allow returning value of careful update

models/api_endpoint.py

@@ -252,7 +252,7 @@ class ApiEndpoint(models.Model):
             else:
                 # use careful_update method if available, else use update
                 if callable(getattr(record_id, "careful_update", None)):
-                    record_id.careful_update(record_values)
+                    return record_id.careful_update(record_values)
                 else:
                     record_id.update(record_values)