Fix $if_mpd_playing and $mpd_percent when you stop playing a song, thanks Sakari...

[monky] / TODO

1.x   - implement _XROOTPMAP_ID and ESETROOT_PMAP_ID alterative for pseudo-transperency.

2.0.0 - schedule TBD
        * rewrite core of Conky in C++
        * implement new features like a cairo backend, network transparency, and whatever else
        * distributed functionality