Egghead download issue for one specific free course

[atuttle]

• I've verified and I assure that I'm running youtube-dl 2017.12.10
• At least skimmed through the README, most notably the FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones

What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl)

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If the purpose of this issue is a bug report, site support request or you are not completely sure provide the full verbose output as follows:

youtube-dl -o "%(autonumber)s-%(title)s.%(ext)s" https://egghead.io/courses/leverage-new-features-of-react-16 --verbose
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-o', u'%(autonumber)s-%(title)s.%(ext)s', u'https://egghead.io/courses/leverage-new-features-of-react-16', u'--verbose']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.12.10
[debug] Python version 2.7.10 - Darwin-16.7.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg 2.8.6, ffprobe 2.8.6
[debug] Proxy map: {}
[egghead:course] leverage-new-features-of-react-16: Downloading course lessons JSON
[egghead:course] leverage-new-features-of-react-16: Downloading course JSON
[download] Downloading playlist: Leverage New Features of React 16
[egghead:course] playlist Leverage New Features of React 16: Collected 6 video ids (downloading 6 of them)
[download] Downloading video 1 of 6
[egghead:lesson] react-error-handling-using-error-boundaries-in-react-16: Downloading JSON metadata
[egghead:lesson] 2464: Downloading m3u8 information
[egghead:lesson] 2464: Downloading MPD manifest
[debug] Default format spec: bestvideo+bestaudio/best
[download] 00001-Error Handling using Error Boundaries in React 16.mp4 has already been downloaded and merged
[download] Downloading video 2 of 6
[egghead:lesson] react-render-multiple-elements-without-a-wrapping-element-in-a-component-in-react-16: Downloading JSON metadata
[egghead:lesson] 2572: Downloading m3u8 information
[egghead:lesson] 2572: Downloading MPD manifest
[debug] Default format spec: bestvideo+bestaudio/best
[download] 00002-Render Multiple Elements without a Wrapping Element in a Component in React 16.mp4 has already been downloaded and merged
[download] Downloading video 3 of 6
[egghead:lesson] react-render-text-only-components-in-react-16: Downloading JSON metadata
ERROR: An extractor error has occurred. (caused by KeyError(u'media_urls',)); please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 437, in extract
    ie_result = self._real_extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/egghead.py", line 97, in _real_extract
    for _, format_url in lesson['media_urls'].items():
KeyError: u'media_urls'
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 784, in extract_info
    ie_result = ie.extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 450, in extract
    raise ExtractorError('An extractor error has occurred.', cause=e)
ExtractorError: An extractor error has occurred. (caused by KeyError(u'media_urls',)); please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.

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Description of your issue, suggested solution and other information

The downloader seems to work fine on other egghead playlists, but has failed for this one in particular for at least the last two versions of yt-dl.

[dstftw]

Videos 3 to 6 are paid ones.