GDCVault/Digitally Speaking: can't find XML element's text ./slideVideo

[steinuil]

$ youtube-dl --verbose http://www.gdcvault.com/play/1014846/Conference-Keynote-Shigeru
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['--verbose', 'http://www.gdcvault.com/play/1014846/Conference-Keynote-Shigeru']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.06.25
[debug] Python version 3.6.1 - FreeBSD-11.0-RELEASE-p1-amd64-64bit-ELF
[debug] exe versions: ffmpeg 3.2.4, ffprobe 3.2.4, rtmpdump 2.4
[debug] Proxy map: {}
[GDCVault] Conference-Keynote-Shigeru: Downloading webpage
[DigitallySpeaking] p25-miyamoto1999_1282467389849HSVB: Downloading XML
ERROR: Could not find XML element's text ./slideVideo; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
Traceback (most recent call last):
  File "/home/steenuil/.local/lib/python3.6/site-packages/youtube_dl/YoutubeDL.py", line 762, in extract_info
    ie_result = ie.extract(url)
  File "/home/steenuil/.local/lib/python3.6/site-packages/youtube_dl/extractor/common.py", line 433, in extract
    ie_result = self._real_extract(url)
  File "/home/steenuil/.local/lib/python3.6/site-packages/youtube_dl/extractor/dispeak.py", line 106, in _real_extract
    video_formats = self._parse_flv(metadata)
  File "/home/steenuil/.local/lib/python3.6/site-packages/youtube_dl/extractor/dispeak.py", line 76, in _parse_flv
    slide_video_path = xpath_text(metadata, './slideVideo', fatal=True)
  File "/home/steenuil/.local/lib/python3.6/site-packages/youtube_dl/utils.py", line 318, in xpath_text
    raise ExtractorError('Could not find XML element\'s text %s' % name)
youtube_dl.utils.ExtractorError: Could not find XML element's text ./slideVideo; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.

Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2017.06.25. If it's not read this FAQ entry and update. Issues with outdated version will be rejected.

• I've verified and I assure that I'm running youtube-dl 2017.06.25

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Description of your issue, suggested solution and other information

This video doesn't seem to come with slides, maybe not finding text in the slideVideo element could be made non-fatal?

http://events.digitallyspeaking.com/gdc/project25/xml/p25-miyamoto1999_1282467389849HSVB.xml