[gnome-control-center] user-accounts: fix language chooser response if language is unknown

[Ondrej Holy <oholy src gnome org>]

commit 4c6ef8568db72455838625c1aed31b50772ab875
Author: Ondrej Holy <oholy redhat com>
Date:   Tue Oct 7 10:49:43 2014 +0200

    user-accounts: fix language chooser response if language is unknown
    
    If language is unknown and language chooser is cancelled, panel crash
    with the following error:
    
    (gnome-control-center:24952): Gtk-CRITICAL **: gtk_list_store_get_path:
    assertion 'iter->stamp == priv->stamp' failed
    
    (gnome-control-center:24952): Gtk-CRITICAL **: gtk_list_store_get_value:
    assertion 'iter_is_valid (iter, list_store)' failed
    
    (gnome-control-center:24952): GLib-GObject-WARNING **: gtype.c:4221:
    type id '0' is invalid
    
    (gnome-control-center:24952): GLib-GObject-WARNING **:
    can't peek value table for type '<invalid>' which is not currently referenced
    Segmentation fault (core dumped)
    
    https://bugzilla.gnome.org/show_bug.cgi?id=738002

 panels/user-accounts/um-user-panel.c |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)
---
diff --git a/panels/user-accounts/um-user-panel.c b/panels/user-accounts/um-user-panel.c
index 3ea3880..0d42694 100644
--- a/panels/user-accounts/um-user-panel.c
+++ b/panels/user-accounts/um-user-panel.c
@@ -842,8 +842,14 @@ language_response (GtkDialog         *dialog,
                         lang = cc_common_language_get_current_language ();
                 }
         }
-        cc_common_language_get_iter_for_language (model, lang, &iter);
-        um_editable_combo_set_active_iter (UM_EDITABLE_COMBO (combo), &iter);
+
+        if (cc_common_language_get_iter_for_language (model, lang, &iter)) {
+                um_editable_combo_set_active_iter (UM_EDITABLE_COMBO (combo), &iter);
+        }
+        else {
+                um_editable_combo_set_active_iter (UM_EDITABLE_COMBO (combo), NULL);
+        }
+
         g_free (lang);
 
         gtk_widget_hide (GTK_WIDGET (dialog));