no changelogs shown after version 1:16.04.16 update

[Jeff]

Description: Ubuntu 16.04.6 LTS
Release: 16.04
update-manager:
  Installed: 1:16.04.16
  Candidate: 1:16.04.16

I noticed lately that changelogs were not downloading for any Ubuntu packages in update-manager.
Running from terminal I saw this error:

  File "/usr/lib/python3/dist-packages/UpdateManager/Core/MyCache.py", line 245, in get_changelog_or_news
    "https locations with username/password are not supported to fetch changelogs"

There are no username/passwords in the changelog pool uri.
I believe I tracked the error to lines 242-243 in MyCache.py:

    res = urlsplit(uri)
    if res.scheme == "https" and res.username != "":

Documentation for 'urlsplit()' indicates res.username should return a 'None' object, not a empty string.
I believe changing the scheme to "https" revealed this bug. The following works properly:

    if res.scheme == "https" and res.username is not None:

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Discaz (drsphoto)]

Duplicate #1849004 ?