https://cnn.iprima.cz - Broken site support

[Wlezley]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2020.07.28
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• I've searched the bugtracker for similar issues including closed ones

Verbose log

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-vvv', u'https://cnn.iprima.cz/porady/hlavni-zpravy/31082020']
WARNING: Assuming --restrict-filenames since file system encoding cannot encode all characters. Set the LC_ALL environment variable to fix this.
[debug] Encodings: locale ANSI_X3.4-1968, fs ANSI_X3.4-1968, out ANSI_X3.4-1968, pref ANSI_X3.4-1968
[debug] youtube-dl version 2020.07.28
[debug] Python version 2.7.13 (CPython) - Linux-3.16.6-042stab145.3-x86_64-with-debian-9.9
[debug] exe versions: ffmpeg 3.2.12-1, ffprobe 3.2.12-1, rtmpdump 2.4
[debug] Proxy map: {}
[IPrima] 31082020: Downloading webpage
ERROR: Unable to extract real id; 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/YoutubeDL.py", line 797, in extract_info
ie_result = ie.extract(url)
File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 530, in extract
ie_result = self._real_extract(url)
File "/usr/local/bin/youtube-dl/youtube_dl/extractor/iprima.py", line 90, in _real_extract
webpage, 'real id')
File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 1005, in _search_regex
raise RegexNotFoundError('Unable to extract %s' % _name)
RegexNotFoundError: Unable to extract real id; 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.

Description

This error appears from today, from the first of September 2020. So far, I have discovered the error only on the "cnn" version of the iprima.cz website.

[Wlezley]

Why was the fix #26507 not included in the 2020.09.06 release?
Therefore, I have to use the developer version unnecessarily. :(