[watchbox] Broken since latest site update

[Cogitri]

Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2017.10.01. 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 Issues with outdated version will be rejected.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 2017.10.01

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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The following sections concretize particular purposed issues, you can erase any section (the contents between triple ---) not applicable to your issue

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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 the -v flag to your command line you run youtube-dl with (youtube-dl -v <your command line>), 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 https://www.watchbox.de/serien/chaika-die-sargprinzessin-15235/ --verbose
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['https://www.watchbox.de/serien/chaika-die-sargprinzessin-15235/', '--verbose']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.10.01
[debug] Python version 3.6.2 - Linux-4.13.4-g6eb9c0fc1-x86_64-with-glibc2.3.4
[debug] exe versions: ffmpeg 3.3.4, ffprobe 3.3.4
[debug] Proxy map: {}
[WatchBox] 15235: Downloading webpage
[WatchBox] 15235: Downloading JSON metadata
ERROR: An extractor error has occurred. (caused by KeyError('title',)); 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 "/usr/x86_64-pc-linux-gnu/lib/python3.6/site-packages/youtube_dl/extractor/common.py", line 434, in extract
    ie_result = self._real_extract(url)
  File "/usr/x86_64-pc-linux-gnu/lib/python3.6/site-packages/youtube_dl/extractor/watchbox.py", line 88, in _real_extract
    compat_str) or source['title']
KeyError: 'title'
Traceback (most recent call last):
  File "/usr/x86_64-pc-linux-gnu/lib/python3.6/site-packages/youtube_dl/extractor/common.py", line 434, in extract
    ie_result = self._real_extract(url)
  File "/usr/x86_64-pc-linux-gnu/lib/python3.6/site-packages/youtube_dl/extractor/watchbox.py", line 88, in _real_extract
    compat_str) or source['title']
KeyError: 'title'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/x86_64-pc-linux-gnu/lib/python3.6/site-packages/youtube_dl/YoutubeDL.py", line 783, in extract_info
    ie_result = ie.extract(url)
  File "/usr/x86_64-pc-linux-gnu/lib/python3.6/site-packages/youtube_dl/extractor/common.py", line 447, in extract
    raise ExtractorError('An extractor error has occurred.', cause=e)
youtube_dl.utils.ExtractorError: An extractor error has occurred. (caused by KeyError('title',)); 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.

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The extractor fails to run with the above error, happens with every series I tried

[dstftw]

Correct URL is https://www.watchbox.de/serien/chaika-die-sargprinzessin-15235/staffel-1/das-maedchen-mit-dem-sarg-auf-den-schultern-359512.html.