[Bug 1849004] Re: update-manager stop to load update descriptions

[Discaz]

I thing there is a bug in MyCache.py :

`if res.scheme == "https" and res.username != "":`

The value of `res.username` is `None` when it is not set, not the empty
string.

Code from UpdateManager/Core/MyCache.py :

```
    def _get_changelog_or_news(self, name, fname, strict_versioning=False,
                               changelogs_uri=None):
        " helper that fetches the file in question "
    ...
        # https uris are not supported when they contain a username/password
        # because the urllib2 https implementation will not check certificates
        # and so its possible to do a man-in-the-middle attack to steal the
        # credentials
        res = urlsplit(uri)
        if res.scheme == "https" and res.username != "":
            raise HttpsChangelogsUnsupportedError(
                "https locations with username/password are not"
                "supported to fetch changelogs")
```

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https://bugs.launchpad.net/bugs/1849004

Title:
  update-manager stop to load update descriptions

Status in update-manager package in Ubuntu:
  Confirmed

Bug description:
  Some time ago (~1-2 weeks) I notice, that update-manager no longer
  load description of updates. Message "Загрузка списка изменений..."
  (Russian message, do not know how it looks in English) never
  disappears. See screenshot

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