[niconico] Extract playlist uploader_id

youtube_dl/extractor/niconico.py

@@ -444,6 +444,7 @@ class NiconicoPlaylistIE(InfoExtractor):
         'info_dict': {
             'id': '27411728',
             'title': 'AKB48のオールナイトニッポン',
+            'uploader_id': '805442',
             'uploader': 'のっく',
         },
         'playlist_mincount': 225,
@@ -466,6 +467,7 @@ class NiconicoPlaylistIE(InfoExtractor):
         return {
             '_type': 'playlist',
             'title': self._search_regex(r'\s+name: "(.*?)"', webpage, 'title'),
+            'uploader_id': self._search_regex(r'\s+user_id: ([0-9]+)', webpage, 'uploader_id'),
             'uploader': self._search_regex(r'\s+nickname: "(.*?)"', webpage, 'uploader'),
             'id': list_id,
             'entries': entries,