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[zdf/arte] Extractor error (KeyError) with at least one title

See original GitHub issue

Checklist

I’m reporting a broken site support
I’ve verified that I’m running youtube-dl version 2021.06.06
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 issues including closed ones

Verbose log

$ ~/youtube-dl --verbose 'https://www.zdf.de/arte/arte-plus-7/page-video-artede-der-mit-dem-wolf-tanzt-100.html'
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'--verbose', u'https://www.zdf.de/arte/arte-plus-7/page-video-artede-der-mit-dem-wolf-tanzt-100.html']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2021.06.06
[debug] Python version 2.7.18 (CPython) - Linux-5.10.0-7-amd64-x86_64-with-debian-11.0
[debug] exe versions: ffmpeg 4.3.2-0, ffprobe 4.3.2-0, rtmpdump 2.4
[debug] Proxy map: {}
[debug] Using fake IP 53.77.8.185 (DE) as X-Forwarded-For.
[ZDF] page-video-artede-der-mit-dem-wolf-tanzt-100: Downloading webpage
[ZDF] page-video-artede-der-mit-dem-wolf-tanzt-100: Downloading JSON content
ERROR: An extractor error has occurred. (caused by KeyError(u'http://zdf.de/rels/streams/ptmd-template',)); 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 "/home/michael/youtube-dl/youtube_dl/extractor/common.py", line 534, in extract
    ie_result = self._real_extract(url)
  File "/home/michael/youtube-dl/youtube_dl/extractor/zdf.py", line 292, in _real_extract
    return self._extract_regular(url, player, video_id)
  File "/home/michael/youtube-dl/youtube_dl/extractor/zdf.py", line 241, in _extract_regular
    return self._extract_entry(player['content'], player, content, video_id)
  File "/home/michael/youtube-dl/youtube_dl/extractor/zdf.py", line 204, in _extract_entry
    'http://zdf.de/rels/streams/ptmd-template'].replace(
KeyError: u'http://zdf.de/rels/streams/ptmd-template'
Traceback (most recent call last):
  File "/home/michael/youtube-dl/youtube_dl/YoutubeDL.py", line 815, in wrapper
    return func(self, *args, **kwargs)
  File "/home/michael/youtube-dl/youtube_dl/YoutubeDL.py", line 836, in __extract_info
    ie_result = ie.extract(url)
  File "/home/michael/youtube-dl/youtube_dl/extractor/common.py", line 547, in extract
    raise ExtractorError('An extractor error has occurred.', cause=e)
ExtractorError: An extractor error has occurred. (caused by KeyError(u'http://zdf.de/rels/streams/ptmd-template',)); 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.