feat(subsonic): fallback to filename when title is missing tags

closes #541

Author: sentriz

server/ctrlsubsonic/spec/construct_by_folder.go

@@ -1,6 +1,7 @@
 package spec
 
 import (
+	"cmp"
 	"path/filepath"
 
 	"go.senan.xyz/gonic/db"
@@ -62,7 +63,7 @@ func NewTCTrackByFolder(t *db.Track, parent *db.Album) *TrackChild {
 		Suffix:      formatExt(t.Ext()),
 		Size:        t.Size,
 		Artist:      t.TagTrackArtist,
-		Title:       t.TagTitle,
+		Title:       cmp.Or(t.TagTitle, t.Filename),
 		TrackNumber: t.TagTrackNumber,
 		DiscNumber:  t.TagDiscNumber,
 		Path: filepath.Join(

server/ctrlsubsonic/spec/construct_by_tags.go

@@ -1,6 +1,7 @@
 package spec
 
 import (
+	"cmp"
 	"path/filepath"
 	"sort"
 
@@ -78,7 +79,7 @@ func NewTrackByTags(t *db.Track, album *db.Album) *TrackChild {
 		Path:               filepath.Join(album.LeftPath, album.RightPath, t.Filename),
 		Size:               t.Size,
 		Suffix:             formatExt(t.Ext()),
-		Title:              t.TagTitle,
+		Title:              cmp.Or(t.TagTitle, t.Filename),
 		TrackNumber:        t.TagTrackNumber,
 		DiscNumber:         t.TagDiscNumber,
 		Type:               "music",