The Completions.py script throws if myget.org can't be reached

[wilfriedb]

When starting Sublime Text and myget.org is not available (for example, blocked by the company's proxy, or when no wifi is available) then Completions.py aborts with the next message:

Reloading plugin Kulture.Completions
Traceback (most recent call last):
  File "/opt/sublime_text/sublime_plugin.py", line 97, in reload_plugin
    obj = t()
  File "/home/username/.config/sublime-text-3/Packages/Kulture/Completions.py", line 27, in __init__
    for package in response:
TypeError: 'bool' object is not iterable''

The script does actually check for errors but then ignores the result, leading to the abort.