[gnome-tweak-tool] Dont crash when failing to load desktop files

[John Stowers <jstowers src gnome org>]

commit 9c6fc89f85fd0ba9c862ed280e5da27faf083e48
Author: John Stowers <john stowers gmail com>
Date:   Thu Aug 22 19:53:56 2013 +0200

    Dont crash when failing to load desktop files

 gtweak/tweaks/tweak_group_startup.py |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gtweak/tweaks/tweak_group_startup.py b/gtweak/tweaks/tweak_group_startup.py
index 20fb13d..791cf13 100644
--- a/gtweak/tweaks/tweak_group_startup.py
+++ b/gtweak/tweaks/tweak_group_startup.py
@@ -18,6 +18,7 @@ from __future__ import print_function
 
 import os.path
 import subprocess
+import logging
 
 from gi.repository import Gtk, GLib, Gio