[arte.tv:+7] If video is not available anymore, provide a properly error message

[andreygursky]

Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2017.08.13. 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 Issues with outdated version will be rejected.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 2017.08.13

Before submitting an issue make sure you have:

• At least skimmed through the README, most notably the FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones

What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
• Feature request (request for a new functionality)
• Question
• Other

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[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-v', u'https://www.arte.tv/de/videos/030273-563-A/arte-reportage']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.08.13
[debug] Python version 2.7.13 - Linux-4.11.0-2-amd64-x86_64-with-debian-9.0
[debug] exe versions: ffmpeg 3.2.4-1, ffprobe 3.2.4-1, rtmpdump 2.4
[debug] Proxy map: {}
[arte.tv:+7] arte-reportage: Downloading webpage
[arte.tv:+7] arte-reportage: Downloading JSON metadata
Traceback (most recent call last):
  File "/usr/lib/python2.7/runpy.py", line 174, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/usr/lib/python2.7/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "/home/andrey/progs/youtube-dl/__main__.py", line 19, in <module>
  File "/home/andrey/progs/youtube-dl/youtube_dl/__init__.py", line 465, in main
  File "/home/andrey/progs/youtube-dl/youtube_dl/__init__.py", line 455, in _real_main
  File "/home/andrey/progs/youtube-dl/youtube_dl/YoutubeDL.py", line 1956, in download
  File "/home/andrey/progs/youtube-dl/youtube_dl/YoutubeDL.py", line 776, in extract_info
  File "/home/andrey/progs/youtube-dl/youtube_dl/extractor/common.py", line 433, in extract
  File "/home/andrey/progs/youtube-dl/youtube_dl/extractor/arte.py", line 203, in _real_extract
  File "/home/andrey/progs/youtube-dl/youtube_dl/extractor/arte.py", line 246, in _extract_from_webpage
  File "/home/andrey/progs/youtube-dl/youtube_dl/extractor/arte.py", line 110, in _extract_from_json_url
AttributeError: 'list' object has no attribute 'items'

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Description of your issue, suggested solution and other information

Such bug has been reported but closed by its reporter: #13289. Actually, if a video is not available anymore, youtube-dl should not stop with an exception in its source code. Please print a properly error message instead: like "cannot find a download link (video is likely not available anymore)".

[andreygursky]

@dstftw, thanks for the fast fix.