[gnome-initial-setup] Be more robust

[Matthias Clasen <matthiasc src gnome org>]

commit 35af5792759eb8ab6a091f81638dd4ba7958f66a
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Mar 1 12:35:13 2014 -0500

    Be more robust
    
    When running gnome-initial-setup for test purposes, and
    quitting it early, we shouldn't crash.

 gnome-initial-setup/gis-assistant.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/gnome-initial-setup/gis-assistant.c b/gnome-initial-setup/gis-assistant.c
index 4522657..097dab9 100644
--- a/gnome-initial-setup/gis-assistant.c
+++ b/gnome-initial-setup/gis-assistant.c
@@ -351,7 +351,9 @@ update_current_page (GisAssistant *assistant,
   update_titlebar (assistant);
   update_applying_state (assistant);
   update_navigation_buttons (assistant);
-  gis_page_shown (page);
+
+  if (page)
+    gis_page_shown (page);
 }
 
 static void