Update yt_dlp/extractor/lbry.py (review)

Co-authored-by: Simon Sawicki <accounts@grub4k.xyz>

yt_dlp/extractor/lbry.py

@@ -334,7 +334,7 @@ class LBRYChannelIE(LBRYBaseIE):
         }
         page_params.update(params)
         result = self._call_api_proxy(
-            'claim_search', claim_ids, page_params, 'page %d' % page)
+            'claim_search', claim_ids, page_params, f'page {page}')
         for item in (result.get('items') or []):
             stream_claim_name = item.get('name')
             stream_claim_id = item.get('claim_id')
@@ -358,7 +358,8 @@ class LBRYChannelIE(LBRYBaseIE):
         return self._call_api_proxy('claim_search', claim_id, page_params, 'playlist')
 
     def _real_extract(self, url):
-        if playlist_id := self._match_valid_url(url).group('id2'):
+        playlist_id = self._match_valid_url(url).group('id2')
+        if playlist_id:
             is_playlist = True
             r = self._fetch_playlist_items(playlist_id)
             result = r.get('items', [])[0]