[gtk+/gtk-2-18] Only set the accesible label if it is non-empty

[Christian Dywan <cdywan src gnome org>]

commit 248854947e07c8177f7bbdb9fd8e1b9ef2ff6e05
Author: Christian Dywan <christian lanedo com>
Date:   Tue Oct 27 00:30:54 2009 +0100

    Only set the accesible label if it is non-empty
    
    Fixes https://bugzilla.gnome.org/show_bug.cgi?id=599446

 gtk/gtktoolbutton.c |   11 +++++++----
 1 files changed, 7 insertions(+), 4 deletions(-)
---
diff --git a/gtk/gtktoolbutton.c b/gtk/gtktoolbutton.c
index 6db8358..5975a51 100644
--- a/gtk/gtktoolbutton.c
+++ b/gtk/gtktoolbutton.c
@@ -916,11 +916,14 @@ gtk_tool_button_set_label (GtkToolButton *button,
   button->priv->label_text = g_strdup (label);
   button->priv->contents_invalid = TRUE;     
 
-  elided_label = _gtk_toolbar_elide_underscores (label);
-  accessible = gtk_widget_get_accessible (GTK_WIDGET (button->priv->button));
-  atk_object_set_name (accessible, elided_label);
+  if (label)
+    {
+      elided_label = _gtk_toolbar_elide_underscores (label);
+      accessible = gtk_widget_get_accessible (GTK_WIDGET (button->priv->button));
+      atk_object_set_name (accessible, elided_label);
+      g_free (elided_label);
+    }
 
-  g_free (elided_label);
   g_free (old_label);
  
   g_object_notify (G_OBJECT (button), "label");