[infoq] Make audio format extraction non fatal (closes #12938)

diff --git a/youtube_dl/extractor/infoq.py b/youtube_dl/extractor/infoq.py
index 9fb71e8effe107c6e182c3537cd634b7ac21e9bb..fe425e786479e505aad8082745d43040d38ba881 100644 (file)
--- a/youtube_dl/extractor/infoq.py
+++ b/youtube_dl/extractor/infoq.py
@@ -87,8 +87,8 @@ class InfoQIE(BokeCCBaseIE):
 
     def _extract_http_audio(self, webpage, video_id):
         fields = self._hidden_inputs(webpage)
-        http_audio_url = fields['filename']
-        if http_audio_url is None:
+        http_audio_url = fields.get('filename')
+        if not http_audio_url:
             return []
 
         cookies_header = {'Cookie': self._extract_cookies(webpage)}