User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.4) Gecko/20070515 Firefox/2.0.0.4
Build Identifier: 

The mpd panel plugin doesn't show the names of songs. That happens for all songs which don't have proper tags, providing e.g. artist or title. In fact the plugin seems to require all tags to be present to function properly.

Reproducible: Always

Steps to Reproduce:

Actual Results:  
Instead of information about the song, a combination of "(null)" strings is displayed.

Screenshot: http://img409.imageshack.us/img409/5049/snapshot1cs2.png

Alternative screenshot: http://img371.imageshack.us/img371/9678/snapshot2rg9.png

Expected Results:  
The plugin should fallback to displaying the filename, possibly stripping the extension for better readabillity.

This is happening with xfce4-mpc-plugin-0.3.0, xfce-4.4.1, on slackware-12rc1, xubuntu7.10 and zenwalk4.6.