Black formatting fix

Author: davidweterings

src/commercetools/testing/abstract.py

@@ -68,8 +68,8 @@ def _store_obj(self, obj):
                         status_code=400,
                         message=msg,
                         error=error.code,
-                        errors=serialized_errors
-                    )
+                        errors=serialized_errors,
+                    ),
                 )
 
         self.objects[key] = document