Be more careful when parsing gtk-decoration-layout

When the string is empty, breaking it at : will not give
us two tokens, and we were parsing garbage, leading to crash.
https://bugzilla.gnome.org/show_bug.cgi?id=721635

diff --git a/gtk/gtkheaderbar.c b/gtk/gtkheaderbar.c
index f466cafb70f22bed9b5188fc7e521c1b3084e5e4..bbe6faad4cdfbcaa3b2c6085c9dfd76c7221e1c7 100644 (file)
--- a/gtk/gtkheaderbar.c
+++ b/gtk/gtkheaderbar.c
@@ -359,7 +359,7 @@ _gtk_header_bar_update_window_buttons (GtkHeaderBar *bar)
           int n_children = 0;
 
           if (tokens[i] == NULL)
-            continue;
+            break;
 
           t = g_strsplit (tokens[i], ",", -1);