@classmethod
    def get_user_defined_metadata(cls):
        return [spec for spec in cls.METADATA_SPECS if not spec.generated]
Show that creator is None when json attribute is empty.
dataset/ETHPy150Open codalab/codalab-cli/codalab/objects/bundle.py/Bundle.get_user_defined_metadata--crossover with--dataset/ETHPy150Open sigmavirus24/github3.py/tests/unit/test_issues_milestone.py/TestMilestone.test_empty_creator