From fc1282b3febc609c4f1f4f6905d0c694c69c6d5e Mon Sep 17 00:00:00 2001
From: Chad Phillips <chad@apartmentlines.com>
Date: Mon, 3 Jul 2017 08:02:49 -0700
Subject: [PATCH] Loosen tfa_results check

Can also return None as well as False, check for falsey values instead.
---
 youtube_dl/extractor/youtube.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/youtube_dl/extractor/youtube.py b/youtube_dl/extractor/youtube.py
index 77cd271ef..6e56b2d6b 100644
--- a/youtube_dl/extractor/youtube.py
+++ b/youtube_dl/extractor/youtube.py
@@ -213,7 +213,7 @@ class YoutubeBaseInfoExtractor(InfoExtractor):
                     self._TFA_URL.format(tl), tfa_req,
                     'Submitting TFA code', 'Unable to submit TFA code')
 
-                if tfa_results is False:
+                if not tfa_results:
                     return False
 
                 tfa_res = try_get(tfa_results, lambda x: x[0][5], list)