Repository: youtube-dl
Issue: Error downloading video from la7.it
Labels: broken-IE,patch-available

Hi, I get the following error when I try to download a video from www.la7.it:
```shellsession
sudo youtube-dl --verbose --no-playlist https://www.la7.it/piazzapulita/rivedila7/piazzapulita-puntata-del-13102022-14-10-2022-455682
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['--verbose', '--no-playlist', 'https://www.la7.it/piazzapulita/rivedila7/piazzapulita-puntata-del-13102022-14-10-2022-455682']
[debug] Encodings: locale UTF-8, fs utf-8, out utf-8, pref UTF-8
[debug] youtube-dl version 2021.12.17
[debug] Python version 3.10.6 (CPython) - Linux-5.19.0-76051900-generic-x86_64-with-glibc2.35
[debug] exe versions: none
[debug] Proxy map: {}
[la7.it] piazzapulita-puntata-del-13102022-14-10-2022-455682: Downloading webpage
ERROR: piazzapulita-puntata-del-13102022-14-10-2022-455682: Failed to parse JSON  (caused by JSONDecodeError('Expecting value: line 4 column 8 (char 422)')); please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 906, in _parse_json
    return json.loads(json_string)
  File "/usr/lib/python3.10/json/__init__.py", line 346, in loads
    return _default_decoder.decode(s)
  File "/usr/lib/python3.10/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib/python3.10/json/decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 4 column 8 (char 422)
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 906, in _parse_json
    return json.loads(json_string)
  File "/usr/lib/python3.10/json/__init__.py", line 346, in loads
    return _default_decoder.decode(s)
  File "/usr/lib/python3.10/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib/python3.10/json/decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 4 column 8 (char 422)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 815, in wrapper
    return func(self, *args, **kwargs)
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 836, in __extract_info
    ie_result = ie.extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 534, in extract
    ie_result = self._real_extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/la7.py", line 51, in _real_extract
    player_data = self._parse_json(
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 910, in _parse_json
    raise ExtractorError(errmsg, cause=ve)
youtube_dl.utils.ExtractorError: piazzapulita-puntata-del-13102022-14-10-2022-455682: Failed to parse JSON  (caused by JSONDecodeError('Expecting value: line 4 column 8 (char 422)')); please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
```