MPD: Fix a missing throw in getStatistics().
MPD: Fix a missing throw in getStatistics().

joansmith/dmix,hurzl/dmix,jcnoir/dmix,joansmith/dmix,hurzl/dmix,0359xiaodong/dmix,jcnoir/dmix,abarisain/dmix,0359xiaodong/dmix,abarisain/dmix