generic video extractor AttributeError on videos from mediacenter.ibm.com

[teridon]

Checklist

• I'm reporting a broken site support issue
• I've verified that I'm running youtube-dl version 2019.09.28
• 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 bug reports including closed ones
• I've read bugs section in FAQ

Verbose log

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', 'https://mediacenter.ibm.com/media/Requirements+ManagementA+DOORS+on+the+International+Space+Station/0_ykj9g05x']
[debug] Encodings: locale cp1252, fs mbcs, out cp1252, pref cp1252
[debug] youtube-dl version 2019.09.28
[debug] Python version 3.4.4 (CPython) - Windows-7-6.1.7601-SP1
[debug] exe versions: ffmpeg 3.4
[debug] Proxy map: {}
[generic] 0_ykj9g05x: Requesting header
WARNING: Falling back on generic information extractor.
[generic] 0_ykj9g05x: Downloading webpage
[generic] 0_ykj9g05x: Extracting information
Traceback (most recent call last):
  File "__main__.py", line 19, in <module>
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpyi91grvc\build\youtube_dl\__init__.py", line 474, in main
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpyi91grvc\build\youtube_dl\__init__.py", line 464, in _real_main
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpyi91grvc\build\youtube_dl\YoutubeDL.py", line 2018, in download
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpyi91grvc\build\youtube_dl\YoutubeDL.py", line 796, in extract_info
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpyi91grvc\build\youtube_dl\extractor\common.py", line 530, in extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpyi91grvc\build\youtube_dl\extractor\generic.py", line 2826, in _real_extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpyi91grvc\build\youtube_dl\extractor\kaltura.py", line 154, in _extract_url
AttributeError: 'NoneType' object has no attribute 'strip'

Description

I'd like to download this video from IBM, but the program exits with an error.