Crash when listing subtitles of a youtube video which has none

[daureg]

On Linux x64 with python 3.3, I get the following error when checking available subtitles of a video without it:

[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['--verbose', '--list-subs', 'http://www.youtube.com/watch?v=sAjKT8FhjI8']
[debug] youtube-dl version 2013.08.08
[debug] Git HEAD: 67fb0c5
[debug] Python version 3.3.2 - Linux-3.10.5-1-ARCH-x86_64-with-arch
[debug] Proxy map: {}
[youtube] Setting language
[youtube] sAjKT8FhjI8: Downloading video webpage
[youtube] sAjKT8FhjI8: Downloading video info webpage
[youtube] sAjKT8FhjI8: Extracting video information
[youtube] sAjKT8FhjI8: Checking available subtitles
Traceback (most recent call last):
  File "/usr/lib/python3.3/runpy.py", line 160, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/usr/lib/python3.3/runpy.py", line 73, in _run_code
    exec(code, run_globals)
  File "./youtube_dl/__main__.py", line 18, in <module>
    youtube_dl.main()
  File "./youtube_dl/__init__.py", line 639, in main
    _real_main(argv)
  File "./youtube_dl/__init__.py", line 623, in _real_main
    retcode = ydl.download(all_urls)
  File "./youtube_dl/YoutubeDL.py", line 573, in download
    videos = self.extract_info(url)
  File "./youtube_dl/YoutubeDL.py", line 312, in extract_info
    ie_result = ie.extract(url)
  File "./youtube_dl/extractor/common.py", line 96, in extract
    return self._real_extract(url)
  File "./youtube_dl/extractor/youtube.py", line 677, in _real_extract
    self._list_available_subtitles(video_id)
  File "./youtube_dl/extractor/youtube.py", line 385, in _list_available_subtitles
    self.report_video_subtitles_available(video_id, sub_lang_list)
  File "./youtube_dl/extractor/youtube.py", line 316, in report_video_subtitles_available
    sub_lang = ",".join(list(sub_lang_list.keys()))
AttributeError: 'tuple' object has no attribute 'keys'

[phihag]

We should check who is setting the list of subtitles to a tuple instead of a dictionary.

[jaimeMF]

This has been fixed with #937.