three minor quirks in a very useful script

[diemoschwarz]

Thank you so much for this script, I have been needing something like this since a long time!
It works very well, but leaves me with these observations:

1. when one of the disks goes away, the script seems to hang (even when the disk comes back). This happened to me with a network drive that got unmounted. The script continues to print progress output lines, but the percentage is stuck.
2. the files in a directory that has been moved on source are indeed moved to the new location on dest, but the original directory on dest stays, but is empty. Is it possible to move the whole dir on dest?
3. Some small files don't get moved with the rest of their folder (e.g. Folder.jpg, AlbumArt...jpg, although they're not in the default exclude list).

Thanks!