[tudou] extractor throws exception

[kotofond]

This video http://www.tudou.com/programs/view/GSsX0jAe9wo has been removed on copyright grounds and youtube-dl doesn't handle that nicely:

C:\WINDOWS\system32>youtube-dl --verbose http://www.tudou.com/programs/view/GSsX0jAe9wo
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['--verbose', 'http://www.tudou.com/programs/view/GSsX0jAe9wo']
[debug] Encodings: locale cp1252, fs mbcs, out cp437, pref cp1252
[debug] youtube-dl version 2016.03.26
[debug] Python version 3.5.1 - Windows-10-10.0.10586-SP0
[debug] exe versions: ffmpeg N-78358-g674cc26, ffprobe N-78358-g674cc26
[debug] Proxy map: {}
[tudou] GSsX0jAe9wo: Downloading JSON metadata
ERROR: An extractor error has occurred. (caused by KeyError('itemSegs',)); 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 "c:\python35\lib\site-packages\youtube_dl\extractor\common.py", line 320, in extract
    return self._real_extract(url)
  File "c:\python35\lib\site-packages\youtube_dl\extractor\tudou.py", line 72, in _real_extract
    segments = self._parse_json(item_data['itemSegs'], video_id)
KeyError: 'itemSegs'
Traceback (most recent call last):
  File "c:\python35\lib\site-packages\youtube_dl\extractor\common.py", line 320, in extract
    return self._real_extract(url)
  File "c:\python35\lib\site-packages\youtube_dl\extractor\tudou.py", line 72, in _real_extract
    segments = self._parse_json(item_data['itemSegs'], video_id)
KeyError: 'itemSegs'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "c:\python35\lib\site-packages\youtube_dl\YoutubeDL.py", line 668, in extract_info
    ie_result = ie.extract(url)
  File "c:\python35\lib\site-packages\youtube_dl\extractor\common.py", line 326, in extract
    raise ExtractorError('An extractor error has occurred.', cause=e)
youtube_dl.utils.ExtractorError: An extractor error has occurred. (caused by KeyError('itemSegs',)); 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.

I understand this is not a big deal since the video is not accessible anyway but I thought maybe youtube-dl could handle that scenario in a better way?

Thanks

[yan12125]

Proper error messages will be printed in the next version.