Unable to download few videos from TED

[sgargbugreporter]

Checklist

• [x ] I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2019.09.12.1
• [x ] 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
• [x ] I've searched the bugtracker for similar issues including closed ones

Verbose log

youtube-dl --verbose https://www.ted.com/talks/monika_blaumueller_how_we_could_use_big_data_to_forecast_the_next_global_outbreak
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['--verbose', 'https://www.ted.com/talks/monika_blaumueller_how_we_could_use_big_data_to_forecast_the_next_global_outbreak']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2019.09.12.1
[debug] Python version 3.6.8 (CPython) - Linux-4.15.0-64-generic-x86_64-with-Ubuntu-18.04-bionic
[debug] exe versions: avconv 3.4.6, avprobe 3.4.6, ffmpeg 3.4.6, ffprobe 3.4.6, phantomjs 2.1.1, rtmpdump 2.4
[debug] Proxy map: {}
[ted] monika_blaumueller_how_we_could_use_big_data_to_forecast_the_next_global_outbreak: Downloading webpage
Traceback (most recent call last):
  File "/home/sachin/.local/bin/youtube-dl", line 11, in <module>
    sys.exit(main())
  File "/home/sachin/.local/lib/python3.6/site-packages/youtube_dl/__init__.py", line 474, in main
    _real_main(argv)
  File "/home/sachin/.local/lib/python3.6/site-packages/youtube_dl/__init__.py", line 464, in _real_main
    retcode = ydl.download(all_urls)
  File "/home/sachin/.local/lib/python3.6/site-packages/youtube_dl/YoutubeDL.py", line 2010, in download
    url, force_generic_extractor=self.params.get('force_generic_extractor', False))
  File "/home/sachin/.local/lib/python3.6/site-packages/youtube_dl/YoutubeDL.py", line 796, in extract_info
    ie_result = ie.extract(url)
  File "/home/sachin/.local/lib/python3.6/site-packages/youtube_dl/extractor/common.py", line 530, in extract
    ie_result = self._real_extract(url)
  File "/home/sachin/.local/lib/python3.6/site-packages/youtube_dl/extractor/ted.py", line 147, in _real_extract
    return self._talk_info(url, name)
  File "/home/sachin/.local/lib/python3.6/site-packages/youtube_dl/extractor/ted.py", line 219, in _talk_info
    for resource in resources:
TypeError: 'NoneType' object is not iterable

Description

Out of 11 TED talks referenced at: https://www.hpe.com/us/en/insights/articles/big-data-ted-talks-11-important-lessons-1909.html, 2 TED Talks are not downloadable.
These are:

1. https://www.ted.com/talks/marie_wallace_the_ethics_of_collecting_data
   
2. https://www.ted.com/talks/monika_blaumueller_how_we_could_use_big_data_to_forecast_the_next_global_outbreak

The errors are the same.

$ youtube-dl https://www.ted.com/talks/marie_wallace_the_ethics_of_collecting_data
[ted] marie_wallace_the_ethics_of_collecting_data: Downloading webpage
Traceback (most recent call last):
  File "/home/sachin/.local/bin/youtube-dl", line 11, in <module>
    sys.exit(main())
  File "/home/sachin/.local/lib/python3.6/site-packages/youtube_dl/__init__.py", line 474, in main
    _real_main(argv)
  File "/home/sachin/.local/lib/python3.6/site-packages/youtube_dl/__init__.py", line 464, in _real_main
    retcode = ydl.download(all_urls)
  File "/home/sachin/.local/lib/python3.6/site-packages/youtube_dl/YoutubeDL.py", line 2010, in download
    url, force_generic_extractor=self.params.get('force_generic_extractor', False))
  File "/home/sachin/.local/lib/python3.6/site-packages/youtube_dl/YoutubeDL.py", line 796, in extract_info
    ie_result = ie.extract(url)
  File "/home/sachin/.local/lib/python3.6/site-packages/youtube_dl/extractor/common.py", line 530, in extract
    ie_result = self._real_extract(url)
  File "/home/sachin/.local/lib/python3.6/site-packages/youtube_dl/extractor/ted.py", line 147, in _real_extract
    return self._talk_info(url, name)
  File "/home/sachin/.local/lib/python3.6/site-packages/youtube_dl/extractor/ted.py", line 219, in _talk_info
    for resource in resources:
TypeError: 'NoneType' object is not iterable