Genres/SubGenres Bug

There seems to be a semi-serious bug in use of genres and subgenres to
organize music.   If you make a genre a subgenre of a genre that
contains no tracks, then the genre disappears from the browse screen,
and you can't even find the artists in that genre by searching or in the
artists lists (but using random works ok).  One may ask, why would
somebody do this?  
 
Example:
 
I want to have a "top level genre" called Rock, which doesn't contain
any tracks, just like 10-12 other sub genres, like Punk, Heavy Metal,
etc. 
 
Also, if subgenres are in a genre, if you use the "Play All in this
Genre" feature, does it include subgenres?
 
Josh "Iceparrot"
 
P.S. Moderators - I accidentally sent this in once under a different,
non registered e-mail.