Add _cache_lookup_by_nocover + Modify _cache_delete_video_meta

- add _cache_lookup_by_nocover  : create function (please I need it)
- Modify _cache_delete_video_meta : add filter for tmbd_(cause tvshow as
not tmdb_id and so can cause error)
- Modify _cache_delete_video_meta : I think commit() was missing. I added it