Falls back on generic extractor and fails for some pages on tv2.no

[TRox1972]

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If the purpose of this issue is a bug report, site support request or you are not completely sure provide the full verbose output as follows:

Add -v flag to your command line you run youtube-dl with, copy the whole output and insert it here. It should look similar to one below (replace it with your log inserted between triple ```):

$ youtube-dl -v http://sumo.tv2.no/programmer/serier/hotel-caesar/hoeydepunkter/jenny-blir-reddet-fra-edvin-904213.html
[debug] System config: []
[debug] User config: []
[debug] Command-line args: [u'-v', u'http://sumo.tv2.no/programmer/serier/hotel-caesar/hoeydepunkter/jenny-blir-reddet-fra-edvin-904213.html']
[debug] Encodings: locale ANSI_X3.4-1968, fs ANSI_X3.4-1968, out ANSI_X3.4-1968, pref ANSI_X3.4-1968
[debug] youtube-dl version 2016.04.19
[debug] Python version 2.7.10 - Linux-2.6.32-042stab112.15-x86_64-with-Ubuntu-15.10-wily
[debug] exe versions: avconv 11.2-6, avprobe 11.2-6, ffmpeg 11.2-6
[debug] Proxy map: {}
[generic] jenny-blir-reddet-fra-edvin-904213: Requesting header
WARNING: Falling back on generic information extractor.
[generic] jenny-blir-reddet-fra-edvin-904213: Downloading webpage
[generic] jenny-blir-reddet-fra-edvin-904213: Extracting information
ERROR: Unsupported URL: http://sumo.tv2.no/programmer/serier/hotel-caesar/hoeydepunkter/jenny-blir-reddet-fra-edvin-904213.html
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/generic.py", line 1374, in _real_extract
    doc = compat_etree_fromstring(webpage.encode('utf-8'))
  File "/usr/local/bin/youtube-dl/youtube_dl/compat.py", line 279, in compat_etree_fromstring
    doc = _XML(text, parser=etree.XMLParser(target=etree.TreeBuilder(element_factory=_element_factory)))
  File "/usr/local/bin/youtube-dl/youtube_dl/compat.py", line 268, in _XML
    parser.feed(text)
  File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 1642, in feed
    self._raiseerror(v)
  File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 1506, in _raiseerror
    raise err
ParseError: syntax error: line 1, column 0
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 673, in extract_info
    ie_result = ie.extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 341, in extract
    return self._real_extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/generic.py", line 2044, in _real_extract
    raise UnsupportedError(url)
UnsupportedError: Unsupported URL: http://sumo.tv2.no/programmer/serier/hotel-caesar/hoeydepunkter/jenny-blir-reddet-fra-edvin-904213.html

Description of your issue, suggested solution and other information

When trying to run the program on some sites on tv2.no, e.g. sumo.tv2.no, it falls back on the generic extractor instead of using the TV2 extractor and fails.

[dstftw]

Duplicate of #9130.