优化迁移

src/main/utils/migrate.ts

@@ -31,7 +31,8 @@ interface OldUserListInfo {
 const filterMusicList = <T extends LX.Music.MusicInfo>(list: T[]): T[] => {
   const ids: Set<string> = new Set()
   return list.filter(s => {
-    if (!s.id || ids.has(s.id) || !s.name || s.singer == null) return false
+    if (!s.id || ids.has(s.id) || !s.name) return false
+    if (s.singer == null) s.singer = ''
     ids.add(s.id)
     return true
   })