current code crashes with name 'gi' is not defined

[Andreas Tennert]

The code that is currently on trunk for light-locker-settings.py, but not released yet, is failing with:

Traceback (most recent call last):
  File "/usr/share/light-locker-settings/light-locker-settings/light-locker-settings.py", line 30, in <module>
    gi.require_version('Gtk', '3.0')
NameError: name 'gi' is not defined

The required fix is to add

import gi

before gi.require_version('Gtk', '3.0')