def normalize_data(data):
    """
    The template reads a json from PubSub that can be a single object
    or a List of objects. This function is used by a FlatMap transformation
    to normalize the input in to individual objects.
    See:
     - https://beam.apache.org/documentation/transforms/python/elementwise/flatmap/
    """  # noqa
    if isinstance(data, list):
        return data
    return [data]