Gets a list of descriptions given the tag.

        :param str tag: (hyphen-separated) tag.
        :return: list of string descriptions. The return list can be empty.

def description(tag):
        """
        Gets a list of descriptions given the tag.

        :param str tag: (hyphen-separated) tag.
        :return: list of string descriptions. The return list can be empty.
        """
        tag_object = Tag(tag)
        results = []
        results.extend(tag_object.descriptions)
        subtags = tag_object.subtags
        for subtag in subtags:
            results += subtag.description

        return results