[gtk+] Make the testsuite happy that get gets the default value

[Matthias Clasen <matthiasc src gnome org>]

commit 0091fc3543dfe904d192076d2e1d7079affbadb6
Author: William Jon McCann <william jon mccann gmail com>
Date:   Tue Jun 25 11:48:16 2013 -0400

    Make the testsuite happy that get gets the default value

 gtk/gtkaboutdialog.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkaboutdialog.c b/gtk/gtkaboutdialog.c
index a9a9c45..890fe51 100644
--- a/gtk/gtkaboutdialog.c
+++ b/gtk/gtkaboutdialog.c
@@ -540,7 +540,7 @@ gtk_about_dialog_class_init (GtkAboutDialogClass *klass)
                                    g_param_spec_string ("logo-icon-name",
                                                         P_("Logo Icon Name"),
                                                         P_("A named icon to use as the logo for the about 
box."),
-                                                        NULL,
+                                                        "image-missing",
                                                         GTK_PARAM_READWRITE));
   /**
    * GtkAboutDialog:wrap-license: