Fix problem where artwork was being overwritten with None on track_update when not specified.
Fix problem where artwork was being overwritten with None on track_update when not specified.

Rosuav/appension,MikeiLL/appension,Rosuav/appension,MikeiLL/appension,Rosuav/appension,Rosuav/appension,MikeiLL/appension,MikeiLL/appension