fix flake8

src/pretix/api/serializers/organizer.py

@@ -649,6 +649,7 @@ class KeyLabelObjectListField(serializers.Field):
         if not value:
             # normalize empty lists to None
             return None
+
         # django added unneccessary keys DELETE, ORDER through formsets, filter them here for backwards compat
         def strip_unknown_keys(v):
             return {k: v[k] for k in v.keys() if k in ("key", "label")}