[gtk+] inspector: Avoid a NULL deref

[Matthias Clasen <matthiasc src gnome org>]

commit ff86433ea1617b73fb0fffec9445ae575119c76a
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Jul 17 18:42:24 2015 -0400

    inspector: Avoid a NULL deref

 gtk/inspector/prop-editor.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/inspector/prop-editor.c b/gtk/inspector/prop-editor.c
index dd17bd4..3283027 100644
--- a/gtk/inspector/prop-editor.c
+++ b/gtk/inspector/prop-editor.c
@@ -1177,7 +1177,7 @@ attribute_editor (GObject                *object,
 
   box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 10);
   gtk_container_add (GTK_CONTAINER (box), gtk_label_new (_("Model:")));
-  text = g_strdup_printf (_("%p (%s)"), model, g_type_name (G_TYPE_FROM_INSTANCE (model)));
+  text = g_strdup_printf (_("%p (%s)"), model, model ? g_type_name (G_TYPE_FROM_INSTANCE (model)) : "null" );
   gtk_container_add (GTK_CONTAINER (box), gtk_label_new (text));
   g_free (text);
   button = gtk_button_new_with_label (_("Properties"));