[dailymotion] python errors after unattended-upgrade including python-apt

[seahorse41]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2020.01.24
• 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

$ youtube-dl -v -F https://www.dailymotion.com/video/x7rbku3
[debug] System config: []
[debug] User config: [u'--restrict-filenames', u'-o', u'~/Downloads/%(title)s.%(uploader)s.%(id)s.%(format_id)s-%(height)sp.%(ext)s']
[debug] Custom config: []
[debug] Command-line args: [u'-v', u'-F', u'https://www.dailymotion.com/video/x7rbku3']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2020.01.24
[debug] Python version 2.7.13 (CPython) - Linux-4.9.0-11-686-pae-i686-with-debian-9.11
[debug] exe versions: ffmpeg N-96573-g73aab08d9d, ffprobe N-96573-g73aab08d9d, rtmpdump 2.4
[debug] Proxy map: {}
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 "/usr/local/bin/youtube-dl/__main__.py", line 19, in <module>
  File "/usr/local/bin/youtube-dl/youtube_dl/__init__.py", line 474, in main
  File "/usr/local/bin/youtube-dl/youtube_dl/__init__.py", line 464, in _real_main
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 2018, in download
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 796, in extract_info
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 530, in extract
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/dailymotion.py", line 235, in _real_extract
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/dailymotion.py", line 50, in _call_api
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/dailymotion.py", line 31, in _get_dailymotion_cookies
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 2831, in _get_cookies
  File "/usr/lib/python2.7/Cookie.py", line 583, in __init__
    if input: self.load(input)
  File "/usr/lib/python2.7/Cookie.py", line 643, in load
    for k, v in rawdata.items():

Description

I am seeing this issue after an unattended-upgrade this morning. It was working last time this week I visited dailymotion. My os is debian.

/var/log/unattended-upgrades/unattended-upgrades-dpkg.log says:
Unpacking python-apt-common (1.4.1) over (1.4.0beta3) ...
Unpacking python3-apt (1.4.1) over (1.4.0beta3) ...
Unpacking python-apt (1.4.1) over (1.4.0~beta3) ...

This looks similar to #20673