Fix playlist loading logic in MusikGame creation and update related template messages

Fix #10

game/models.py

@@ -99,6 +99,9 @@ def generateYoutubePlaylist(sender, instance, created, **kwargs):
 
     if creds := instance.group.owner.youtubecredentials:
         tasks.generate_playlist.delay_on_commit(creds.credentials, instance.pk)
+    else:
+        instance.playlist_loading = False
+        instance.save()
 
 
 @receiver(post_delete, sender=MusikGame)