[alacarte] MainWindow: Re-add sys import

[Jasper St. Pierre <jstpierre src gnome org>]

commit ae599a8aed08a3fc7e4298870b69009aa933f57a
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Thu Sep 19 13:04:29 2013 -0400

    MainWindow: Re-add sys import
    
    Spotted by Laruent Bigonville

 Alacarte/MainWindow.py |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/Alacarte/MainWindow.py b/Alacarte/MainWindow.py
index a4cd04b..fbb42e4 100644
--- a/Alacarte/MainWindow.py
+++ b/Alacarte/MainWindow.py
@@ -20,6 +20,7 @@
 import gi
 gi.require_version('Gtk', '3.0')
 from gi.repository import Gtk, GObject, Gio, GdkPixbuf, Gdk, GMenu, GLib
+import sys
 import cgi
 import os
 import gettext