Age Gated Video fails to parse when not using --verbose flag

[Atreidae]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2020.09.20
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• I've searched the bugtracker for similar issues including closed ones

Potentially related to: #22188

Verbose log

(Note, this works fine when verbose. Hence I'm posting verbose and non-verbose

Non-Verbose (Fails)

PS D:> .\youtube-dl.exe -F https://www.youtube.com/watch?v=jpef1-twAKo
[youtube] jpef1-twAKo: Downloading webpage
[youtube] jpef1-twAKo: Downloading embed webpage
[youtube] jpef1-twAKo: Refetching age-gated info webpage
Traceback (most recent call last):
File "main.py", line 19, in
File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpksi3o1r1\build\youtube_dl_init_.py", line 474, in main
File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpksi3o1r1\build\youtube_dl_init_.py", line 464, in _real_main
File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpksi3o1r1\build\youtube_dl\YoutubeDL.py", line 2019, in download
File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpksi3o1r1\build\youtube_dl\YoutubeDL.py", line 797, in extract_info
File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpksi3o1r1\build\youtube_dl\extractor\common.py", line 532, in extract
File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpksi3o1r1\build\youtube_dl\extractor\youtube.py", line 2103, in real_extract
File "C:\Python\Python34\lib\json_init.py", line 312, in loads
TypeError: the JSON object must be str, not 'NoneType'

Verbose version (working)

PS D:> .\youtube-dl.exe -F https://www.youtube.com/watch?v=jpef1-twAKo --verbose
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-F', 'https://www.youtube.com/watch?v=jpef1-twAKo', '--verbose']
[debug] Encodings: locale cp1252, fs mbcs, out cp437, pref cp1252
[debug] youtube-dl version 2020.09.20
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.19041
[debug] exe versions: ffmpeg 4.3.1-full_build-www.gyan.dev
[debug] Proxy map: {}
[youtube] jpef1-twAKo: Refetching age-gated info webpage
[youtube] {18} signature length 111, html5 player 4b1ba5ea
[youtube] {22} signature length 111, html5 player 4b1ba5ea
[youtube] {137} signature length 111, html5 player 4b1ba5ea
[youtube] {248} signature length 107, html5 player 4b1ba5ea
[youtube] {299} signature length 111, html5 player 4b1ba5ea
[youtube] {303} signature length 111, html5 player 4b1ba5ea
[youtube] {136} signature length 107, html5 player 4b1ba5ea
[youtube] {247} signature length 111, html5 player 4b1ba5ea
[youtube] {298} signature length 111, html5 player 4b1ba5ea
[youtube] {302} signature length 111, html5 player 4b1ba5ea
[youtube] {135} signature length 107, html5 player 4b1ba5ea
[youtube] {244} signature length 111, html5 player 4b1ba5ea
[youtube] {134} signature length 111, html5 player 4b1ba5ea
[youtube] {243} signature length 111, html5 player 4b1ba5ea
[youtube] {133} signature length 111, html5 player 4b1ba5ea
[youtube] {242} signature length 111, html5 player 4b1ba5ea
[youtube] {160} signature length 107, html5 player 4b1ba5ea
[youtube] {278} signature length 111, html5 player 4b1ba5ea
[youtube] {140} signature length 111, html5 player 4b1ba5ea
[youtube] {249} signature length 111, html5 player 4b1ba5ea
[youtube] {250} signature length 111, html5 player 4b1ba5ea
[youtube] {251} signature length 111, html5 player 4b1ba5ea
[info] Available formats for jpef1-twAKo:
format code extension resolution note
249 webm audio only tiny 66k , opus @ 50k (48000Hz), 15.60MiB
250 webm audio only tiny 86k , opus @ 70k (48000Hz), 20.51MiB
140 m4a audio only tiny 130k , m4a_dash container, mp4a.40.2@128k (44100Hz), 38.25MiB
251 webm audio only tiny 165k , opus @160k (48000Hz), 40.24MiB
278 webm 256x144 144p 112k , webm container, vp9, 30fps, video only, 28.27MiB
160 mp4 256x144 144p 114k , avc1.4d400c, 30fps, video only, 28.74MiB
133 mp4 426x240 240p 251k , avc1.4d4015, 30fps, video only, 58.36MiB
242 webm 426x240 240p 254k , vp9, 30fps, video only, 62.71MiB
243 webm 640x360 360p 559k , vp9, 30fps, video only, 115.24MiB
134 mp4 640x360 360p 651k , avc1.4d401e, 30fps, video only, 145.93MiB
244 webm 854x480 480p 941k , vp9, 30fps, video only, 205.86MiB
135 mp4 854x480 480p 1192k , avc1.4d401f, 30fps, video only, 269.38MiB
247 webm 1280x720 720p 2057k , vp9, 30fps, video only, 407.46MiB
136 mp4 1280x720 720p 2404k , avc1.4d401f, 30fps, video only, 490.97MiB
302 webm 1280x720 720p60 3006k , vp9, 60fps, video only, 689.61MiB
298 mp4 1280x720 720p60 3548k , avc1.4d4020, 60fps, video only, 768.67MiB
248 webm 1920x1080 1080p 3560k , vp9, 30fps, video only, 716.28MiB
137 mp4 1920x1080 1080p 4470k , avc1.640028, 30fps, video only, 854.54MiB
303 webm 1920x1080 1080p60 5121k , vp9, 60fps, video only, 1.16GiB
299 mp4 1920x1080 1080p60 5929k , avc1.64002a, 60fps, video only, 1.30GiB
18 mp4 640x360 360p 711k , avc1.42001E, 30fps, mp4a.40.2@ 96k (44100Hz), 214.33MiB
22 mp4 1280x720 720p 1757k , avc1.64001F, 30fps, mp4a.40.2@192k (44100Hz) (best)
PS D:>

Description

Hi there, trying to post as much helpful info as I can, but seems Youtube-DL doesn't like parsing the age-gate page as a type isn't declared. The interesting part is whatever variable appears to get declared when using the --verbose flag and works perfectly.

Hope this helps.