AlbumTrack: Don't include missing files when listing by genre

src/AlbumTrack.cpp

@@ -152,7 +152,7 @@ std::vector<MediaPtr> AlbumTrack::fromGenre( MediaLibraryPtr ml, int64_t genreId
 {
     std::string req = "SELECT m.* FROM " + policy::MediaTable::Name + " m"
             " INNER JOIN " + policy::AlbumTrackTable::Name + " t ON m.id_media = t.media_id"
-            " WHERE t.genre_id = ? ORDER BY ";
+            " WHERE t.genre_id = ? AND m.is_present = 1 ORDER BY ";
     switch ( sort )
     {
     case SortingCriteria::Duration: