From 74da856544177c15d95ffa78c5eda4d7089f8efd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sergey=20M=E2=80=A4?= <dstftw@gmail.com>
Date: Mon, 1 May 2017 01:23:05 +0700
Subject: [PATCH] [infoq] Make audio format extraction non fatal (closes
 #12938)

---
 youtube_dl/extractor/infoq.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/youtube_dl/extractor/infoq.py b/youtube_dl/extractor/infoq.py
index 9fb71e8ef..fe425e786 100644
--- 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)}