e.g. http://musicbrainz.org/search?query=name%3A%22%E5%9C%A8%E6%B2%92%E6%9C%89%E9%9B%A8%E6%B0%B4%E6%BB%8B%E6%BD%A4%E7%9A%84%E6%98%9F%E7%90%83%E4%B8%8A%E6%98%AF%E7%84%A1%E6%B3%95%E4%BB%98%E5%87%BA%E6%84%9B%E7%9A%84%E5%90%A7%22&type=annotation&limit=25&advanced=1 is empty but still shows up.

I would personally exclude empty annotations since it doesn't seem to be particularly useful. If for some reason people want to be able to find empty annotations, then I'd like a way of filtering them out.