Mus 19 library sync completing with issues (#29)

* fix: Sync issues - AudioDB warmig +  automatic sync skips

* progress ui/ux + discovery and album fixes

* artist fixes

* several request level fixes and improvements

* handle request fails + artist refresh + resilience fixes

* fix format

* fix stop sync fail + last.fn mbid issues + failures/validation reworks

backend/repositories/lidarr/album.py

@@ -423,7 +423,7 @@ class LidarrAlbumRepository(LidarrHistoryRepository):
 
         async def album_is_indexed():
             a = await self._get_album_by_foreign_id(musicbrainz_id)
-            return a and a.get("id")
+            return a if a and a.get("id") else None
 
         # Only wait for auto-indexing if we just created/refreshed the artist;
         # for existing artists nothing triggered new indexing, so skip the long wait.