[pornhub] both embed/write thumbnail flag gives error for channels first video

[vxbinaca]

Edit: Might it be wiser for this kind of issue to just give a Warning instead of an Error that halts channel ripping? Youtube doesn't halt rips for annotations or subtitles that weren't found.

youtube-dl -v http://www.pornhub.com/view_video.php?viewkey=ph56bcac441477b

[debug] System config: []
[debug] User config: [u'--download-archive', u'~/.ytdlarchive', u'--retries', u'100', u'--no-overwrites', u'--call-home', u'--continue', u'--write-info-json', u'--write-description', u'--write-thumbnail', u'--write-annotations', u'--all-subs', u'--write-sub', u'--add-metadata', u'-f', u'bestvideo+bestaudio/best', u'--merge-output-format', u'mkv', u'--prefer-ffmpeg', u'--embed-thumbnail']
[debug] Command-line args: [u'-v', u'http://www.pornhub.com/view_video.php?viewkey=ph56bcac441477b']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2016.03.27
[debug] Python version 2.7.10 - Linux-4.2.0-34-generic-x86_64-with-Ubuntu-15.10-wily
[debug] exe versions: ffmpeg 2.7.6-0ubuntu0.15.10.1, ffprobe 2.7.6-0ubuntu0.15.10.1, rtmpdump 2.4
[debug] Proxy map: {}
[debug] Public IP address: 76.101.221.232
[PornHub] ph56bcac441477b: Downloading webpage
WARNING: There's no description to write.
[info] Video annotations are already present
[info] Video description metadata is already present
[debug] Invoking downloader on u'http://cdn2b.video.pornhub.phncdn.com/videos/201602/11/68463451/480P_600K_68463451.mp4?rs=48&ri=1000&ipa=76.101.221.232&s=1459101499&e=1459108699&h=738734f0530238b01f1ba4e02385a1d0'
[download] BUTTPLUG HIDDEN CAM CAUGHT MASTURBATION-ph56bcac441477b.mp4 has already been downloaded
[download] 100% of 7.61MiB
[ffmpeg] Adding metadata to 'BUTTPLUG HIDDEN CAM CAUGHT MASTURBATION-ph56bcac441477b.mp4'
[debug] ffmpeg command line: ffmpeg -y -i 'file:BUTTPLUG HIDDEN CAM CAUGHT MASTURBATION-ph56bcac441477b.mp4' -c copy -metadata artist=Zoe_Ph -metadata 'purl=http://www.pornhub.com/view_video.php?viewkey=ph56bcac441477b' -metadata 'title=BUTTPLUG HIDDEN CAM CAUGHT MASTURBATION' 'file:BUTTPLUG HIDDEN CAM CAUGHT MASTURBATION-ph56bcac441477b.temp.mp4'
ERROR: Thumbnail was not found. Nothing to do.
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/YoutubeDL.py", line 1770, in post_process
    files_to_delete, info = pp.run(info)
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/postprocessor/embedthumbnail.py", line 34, in run
    raise EmbedThumbnailPPError('Thumbnail was not found. Nothing to do.')
EmbedThumbnailPPError