[Plugin: BuddyPress] Missing adminbar.css

Google Chrome reports adminbar.css is missing in the plugin css directory:

Failed to load resource: the server responded with a status of 404 (Not Found)
http://XXX.com/wp-content/plugins/buddypress/bp-themes/bp-default/_inc/css/adminbar.css

I thought I may have removed it by accident, so I downloaded the zip, and it’s not there in 1.5.3.1 either. I created an empty file by that name in the plugin css, and the error goes away.

Links to existing discussions about this would be welcome. Thanks!

http://wordpress.org/extend/plugins/buddypress/