[gnome-panel] menu: don't use XDG_MENU_PREFIX if empty

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 2c2279a4b0e20eb818e451c930cb01b11156257e
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Fri Oct 31 20:31:21 2014 +0200

    menu: don't use XDG_MENU_PREFIX if empty

 gnome-panel/menu.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/gnome-panel/menu.c b/gnome-panel/menu.c
index 9c5b67b..f6318dd 100644
--- a/gnome-panel/menu.c
+++ b/gnome-panel/menu.c
@@ -28,6 +28,7 @@
 #include <gio/gio.h>
 #include <gdk/gdkkeysyms.h>
 
+#include <libpanel-util/panel-glib.h>
 #include <libpanel-util/panel-keyfile.h>
 #include <libpanel-util/panel-xdg.h>
 
@@ -1496,5 +1497,5 @@ get_applications_menu (void)
 {
        const gchar *xdg_menu_prefx = g_getenv ("XDG_MENU_PREFIX");
        return g_strdup_printf ("%sapplications.menu",
-                               xdg_menu_prefx ? xdg_menu_prefx : "gnome-");
+                               !PANEL_GLIB_STR_EMPTY (xdg_menu_prefx) ? xdg_menu_prefx : "gnome-");
 }