Filter out tracks which don't have valid album metadata

Apply a final sanity filter to tracklist to validate assumption in matching
algorithm that the album has certain fields available.

In most situations this filter is not necessary, but occasionally we do
seem to encounter tracks that have no album metadata

src/spotify_to_tidal/sync.py

@@ -184,7 +184,8 @@ def _get_tracks_from_spotify_playlist(offset: int, playlist_id: str):
     print(f"Loading tracks from Spotify playlist '{spotify_playlist['name']}'")
     items = await repeat_on_request_error( _fetch_all_from_spotify_in_chunks, lambda offset: _get_tracks_from_spotify_playlist(offset=offset, playlist_id=spotify_playlist["id"]))
     track_filter = lambda item: item.get('type', 'track') == 'track' # type may be 'episode' also
-    return list(filter(track_filter, items))
+    sanity_filter = lambda item: 'album' in item and 'name' in item['album'] and 'artists' in item['album'] and len(item['album']['artists']) > 0
+    return list(filter(sanity_filter, filter(track_filter, items)))
 
 def populate_track_match_cache(spotify_tracks_: Sequence[t_spotify.SpotifyTrack], tidal_tracks_: Sequence[tidalapi.Track]):
     """ Populate the track match cache with all the existing tracks in Tidal playlist corresponding to Spotify playlist """