'Remove, if transcripts content exists.'

def clear_subs_content(self):

    for youtube_id in self.get_youtube_ids().values():
        filename = 'subs_{0}.srt.sjson'.format(youtube_id)
        content_location = StaticContent.compute_location(self.course.id, filename)
        try:
            content = contentstore().find(content_location)
            contentstore().delete(content.get_id())
        except NotFoundError:
            pass
