def get_url_decorator(self, pattern):
        "Fixes bug in Application.get_url_decorator wich would decorate None values."
        permissions = self.get_permissions(pattern.name)
        if permissions is None:
            return permissions_required(permissions)

        return None
dataset/ETHPy150Open django-oscar/django-oscar-api/oscarapi/app.py/RESTApiApplication.get_url_decorator/operator `is not` -> `is`