[Tracker] Empty metadata

[Brian Davis <brian william davis gmail com>]

Jamie et al, 

Hum is, as of Tracker r587, once again getting empty metadata results
after calls to tracker_metadata_get(). I get a series of empty strings
for all "Audio:*" keys, but valid values for "File:*" keys. 

Earlier this week I noticed that metadata was being returned by
tracker_metadata_get(), but it was stemmed. I'm not sure which is
worse: incorrect titles and artist names or none at all ;)

All kidding aside, I'd love to help out, but am not sure where to
start. Jamie, if you could point me to where you'd like me to dig
around (or if you'd prefer I don't poke where I'm not invited), please
do let me know. 

Take care, 

Brian