exists? (MusicBrainz::Client)

    /*
     * See if a piece of information exists in data returned by a successful query by a MusicBrainz::Client object.
     *
     * Note: Certain result queries require an ordinal argument.  See the
     * MusicBrainz result query (MBE_*) documentation for additional
     * information.
     *
     * Aliases:
     *   MusicBrainz::Client#result_exists?
     *   MusicBrainz::Client#does_result_exist?
     *
     * Examples:
     *   # does the current album have a name?
     *   puts 'named album' if mb.exists? MusicBrainz::Query::AlbumGetAlbumName
     *
     *   # does the current album have a type?
     *   puts 'has a type' if mb.exists? MusicBrainz::Query::AlbumGetAlbumType
     */
    static VALUE mb_client_exists(int argc, VALUE *argv, VALUE self) {