Do not let one private video hold up the rest

tubesync/sync/tasks.py

@@ -599,9 +599,12 @@ def save_all_media_for_source(source_id):
         downloaded=False,
     )
     for media in refresh_qs:
+        try:
             media.refresh_formats
             media.save()
             already_saved.add(media.uuid)
+        except YouTubeError:
+            pass
 
     # Trigger the post_save signal for each media item linked to this source as various
     # flags may need to be recalculated