[pygobject] Fix demo for override changes.

[Paolo Borelli <pborelli src gnome org>]

commit dbb16571803bf51f497768bf80944514f4290ee5
Author: Paolo Borelli <pborelli gnome org>
Date:   Wed Dec 8 18:25:15 2010 +0100

    Fix demo for override changes.

 demos/gtk-demo/gtk-demo.py |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/demos/gtk-demo/gtk-demo.py b/demos/gtk-demo/gtk-demo.py
index 8a8c3e0..382d2c9 100755
--- a/demos/gtk-demo/gtk-demo.py
+++ b/demos/gtk-demo/gtk-demo.py
@@ -175,10 +175,11 @@ class GtkDemoApp(object):
         Gtk.Window.set_default_icon_list(list)
 
     def selection_cb(self, selection, model):
-        (success, m, treeiter) = selection.get_selected()
-        if not success:
+        sel = selection.get_selected()
+        if sel == ():
             return
 
+        treeiter = sel[1]
         demo = model.get_value(treeiter, 1)
 
         title = demo.title