webpage = self._download_webpage(url, playlist_id)
- json_ld_info = self._search_json_ld(webpage, playlist_id, default=None)
+ json_ld_info = self._search_json_ld(webpage, playlist_id, default={})
timestamp = json_ld_info.get('timestamp')
playlist_title = json_ld_info.get('title')