logan
128fa85a65
A track with no cover art omitted mpris:artUrl entirely, and KDE's media controller keeps showing the last image it was handed -- so the taskbar preview for an untagged track displayed the cover of whichever earlier album happened to have one, where the user has no way to tell it is stale. The key is now always published, empty when there is nothing. Omitting a field is what an absent value naturally reads as, and artwork is the one field where that is wrong. The dictionary build is extracted so it can be asserted on without a bus. Every other field stays absent when empty -- a title of "" would make players show a blank line where they would otherwise fall back to the filename. Refs #41