fixup! testutils: add support for configs

repos/system_upgrade/common/libraries/testutils.py

@@ -67,6 +67,7 @@ def error(self, *args):
     def __call__(self):
         return self
 
+
 def _make_default_config(actor_config_schema):
     """ Make a config dict populated with default values. """
     merged_schema = normalize_schemas((actor_config_schema, ))