[gtk+] icon-browser: Don't crash on exit

[Matthias Clasen <matthiasc src gnome org>]

commit 10412dd34133e7424ec3b124d5138fe01d1d8ff1
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Jul 29 14:50:10 2014 +0200

    icon-browser: Don't crash on exit

 demos/icon-browser/iconbrowserwin.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/demos/icon-browser/iconbrowserwin.c b/demos/icon-browser/iconbrowserwin.c
index 6bb0684..47c621d 100644
--- a/demos/icon-browser/iconbrowserwin.c
+++ b/demos/icon-browser/iconbrowserwin.c
@@ -176,6 +176,9 @@ selected_context_changed (GtkListBox *list, IconBrowserWindow *win)
   GtkWidget *label;
 
   row = GTK_WIDGET (gtk_list_box_get_selected_row (list));
+  if (row == NULL)
+    return;
+
   label = gtk_bin_get_child (GTK_BIN (row));
   win->current_context = g_object_get_data (G_OBJECT (label), "context");
   gtk_tree_model_filter_refilter (win->filter_model);