[PATCH, regression] changelog not displayed (1:16.04.16)

[Tormod Volden]

Because urlsplit() is returning None instead of "" in the username member the logic in MyCache.py falsely thinks the URI contains a username.

Exception in thread Thread-4:
Traceback (most recent call last):
  File "/usr/lib/python3.5/threading.py", line 914, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.5/threading.py", line 862, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib/python3/dist-packages/UpdateManager/Core/MyCache.py", line 320, in get_news_and_changelog
    self.get_changelog(name)
  File "/usr/lib/python3/dist-packages/UpdateManager/Core/MyCache.py", line 376, in get_changelog
    changelog = self._get_changelog_or_news(name, "changelog")
  File "/usr/lib/python3/dist-packages/UpdateManager/Core/MyCache.py", line 245, in _get_changelog_or_news
    "https locations with username/password are not"
UpdateManager.Core.MyCache.HttpsChangelogsUnsupportedError: https locations with username/password are notsupported to fetch changelogs