This script is great!

I use it to fetch a couple of weekly mp3s from the BBC, and found that
adding these lines to the end of the script meant I didn't end up with
directories containing only empty m3u files:

--cut here--
# Discard empty podcast files / data directories
[ -s $datadir/podcast.m3u ] || rm $datadir/podcast.m3u
rmdir $datadir 2>/dev/null
--cut here--

There's probably a more elegant way to do this, but hey! It works :-)