message: fix: can't save dataset modal
diff: @@ -81,7 +81,7 @@ class Datasource(BaseSupersetView):
  if "owners" in datasource_dict and orm_datasource.owner_class is not None:
  # Check ownership
  - if app.config["OLD_API_CHECK_DATASET_OWNERSHIP"]:
  + if app.config.get("OLD_API_CHECK_DATASET_OWNERSHIP"):
  # mimic the behavior of the new dataset command that
  # checks ownership and ensures that non-admins aren't locked out
  # of the object
  