Created attachment 736404 [details]
Gnome-Tweak-Tool: RuntimeError

After last update, Gnome-tweak isn't able to start anymore for the regular
user. Running 'gnomesu gnome-tweak-tool' opens the app for root user correctly:
Here's the begining of the error:
```
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/gtweak/app.py", line 39, in
do_activate
    self.win = Window(self, model)
  File "/usr/lib/python2.7/site-packages/gtweak/tweakview.py", line 58, in
__init__
    self._model.load_tweaks(self)
  File "/usr/lib/python2.7/site-packages/gtweak/tweakmodel.py", line 125, in
load_tweaks
    mods = __import__("gtweak.tweaks", globals(), locals(), tweak_files, 0)
  File
"/usr/lib/python2.7/site-packages/gtweak/tweaks/tweak_group_keymouse.py", line
76, in <module>
    PrimaryPasteTweak(),
  File
"/usr/lib/python2.7/site-packages/gtweak/tweaks/tweak_group_keymouse.py", line
29, in __init__
    GetterSetterSwitchTweak.__init__(self, _("Middle-click Paste"), **options)
  File "/usr/lib/python2.7/site-packages/gtweak/widgets.py", line 459, in
__init__
    sw.set_active(self.get_active())
  File
"/usr/lib/python2.7/site-packages/gtweak/tweaks/tweak_group_keymouse.py", line
32, in get_active
    return self._xsettings.get_enable_primary_paste()
  File "/usr/lib/python2.7/site-packages/gtweak/utils.py", line 303, in
get_enable_primary_paste
    return self._get_override('Gtk/EnablePrimaryPaste', True)
  File "/usr/lib/python2.7/site-packages/gtweak/utils.py", line 289, in
_get_override
    return self._variant[name]
  File "/usr/lib64/python2.7/site-packages/gi/overrides/GLib.py", line 406, in
__getitem__
    return val.unpack()
  File "/usr/lib64/python2.7/site-packages/gi/overrides/GLib.py", line 328, in
unpack
    return self.get_variant().unpack()
```
The rest is in attachement