XML parse error on phoenix media center

[Bachsau]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2021.04.26
• 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

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', 'https://www.phoenix.de/sendungen/gespraeche/phoenix-persoenlich/buergermeister-dirk-neubauer-zu-gast-bei-michael-krons-a-2114890.html']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2021.04.26
[debug] Python version 3.7.10 (CPython) - Darwin-18.7.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg 4.4, ffprobe 4.4, rtmpdump 2.4
[debug] Proxy map: {}
ERROR: 2155795: Failed to parse XML  (caused by ParseError('not well-formed (invalid token): line 1, column 0')); 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 "/Users/XXX/.local/bin/youtube-dl/youtube_dl/extractor/common.py", line 856, in _parse_xml
    return compat_etree_fromstring(xml_string.encode('utf-8'))
  File "/Users/XXX/.local/bin/youtube-dl/youtube_dl/compat.py", line 2542, in compat_etree_fromstring
    return etree.XML(text, parser=etree.XMLParser(target=_TreeBuilder()))
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/xml/etree/ElementTree.py", line 1315, in XML
    parser.feed(text)
  File "<string>", line None
xml.etree.ElementTree.ParseError: not well-formed (invalid token): line 1, column 0
Traceback (most recent call last):
  File "/Users/XXX/.local/bin/youtube-dl/youtube_dl/extractor/common.py", line 856, in _parse_xml
    return compat_etree_fromstring(xml_string.encode('utf-8'))
  File "/Users/XXX/.local/bin/youtube-dl/youtube_dl/compat.py", line 2542, in compat_etree_fromstring
    return etree.XML(text, parser=etree.XMLParser(target=_TreeBuilder()))
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/xml/etree/ElementTree.py", line 1315, in XML
    parser.feed(text)
  File "<string>", line None
xml.etree.ElementTree.ParseError: not well-formed (invalid token): line 1, column 0

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/XXX/.local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 806, in wrapper
    return func(self, *args, **kwargs)
  File "/Users/XXX/.local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 827, in __extract_info
    ie_result = ie.extract(url)
  File "/Users/XXX/.local/bin/youtube-dl/youtube_dl/extractor/common.py", line 534, in extract
    ie_result = self._real_extract(url)
  File "/Users/XXX/.local/bin/youtube-dl/youtube_dl/extractor/phoenix.py", line 88, in _real_extract
    'profile': 'player2',
  File "/Users/XXX/.local/bin/youtube-dl/youtube_dl/extractor/common.py", line 849, in _download_xml
    expected_status=expected_status)
  File "/Users/XXX/.local/bin/youtube-dl/youtube_dl/extractor/common.py", line 833, in _download_xml_handle
    fatal=fatal), urlh
  File "/Users/XXX/.local/bin/youtube-dl/youtube_dl/extractor/common.py", line 860, in _parse_xml
    raise ExtractorError(errmsg, cause=ve)
youtube_dl.utils.ExtractorError: 2155795: Failed to parse XML  (caused by ParseError('not well-formed (invalid token): line 1, column 0')); 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.

Description

youtube-dl fails to download this url, seemingly just because of a missing or malformed xml intro. Maybe you could apply some simple sanitization on XMLs to avoid parsing errors.