'age_limit': self._rta_search(webpage),
})
- domain_name = self._search_regex(r'^(?:https?://)?([^/]*)/.*', url, 'video uploader')
+ domain_name = self._search_regex(r'^(?:https?://)?([^/]*)/.*', url, 'video uploader', default=None)
# Sometimes embedded video player is hidden behind percent encoding
# (e.g. https://github.com/ytdl-org/youtube-dl/issues/2448)