don't try to load missing tracks when there aren't any (also ignore previous commit message i forgot to switch layouts)

lib/sc/playlist.go

@@ -161,6 +161,10 @@ func (p *Playlist) GetMissingTracks() error {
 		}
 	}
 
+	if len(missing) == 0 {
+		return nil
+	}
+
 	res, next, err := GetMissingTracks(missing)
 	if err != nil {
 		return err