tracker: Don't crash on unknown profile
tracker: Don't crash on unknown profile

Pelagicore/Media-Manager-Rygel-patched,Tarnyko/rygel,GNOME/rygel,Pelagicore/Media-Manager-Rygel-patched,Pelagicore/Media-Manager-Rygel-patched,luisbg/rygel,jku/rygel,jku/rygel,GNOME/rygel,Tarnyko/rygel,GNOME/rygel