Merge "Return current song id if active quene item id is not avaliable"

    String getCurrentMediaId() {

        String id = mMediaPlayerList.getCurrentMediaId();

        if (id != null) return id;

        if (id != null && !id.isEmpty()) return id;

        Metadata song = getCurrentSongInfo();

        if (song != null) return song.mediaId;

        if (song != null && !song.mediaId.isEmpty()) return song.mediaId;

        // We always want to return something, the error string just makes debugging easier

        return "error";