app-helper menus with blank pixmap?

[Dietmar Maurer <dm vlsivie tuwien ac at>]

Some app-helper menu items use a blank pixmap (I think the should use
GNOME_APP_PIXMAP_NONE)

gnome-app-helper.c:
{ GNOME_APP_UI_ITEM, N_("Create New _Window"), N_("Create a new
window"),
NULL, NULL, NULL,
GNOME_APP_PIXMAP_STOCK, GNOME_STOCK_MENU_BLANK,
GNOME_KEY_NAME_NEW_WINDOW, GNOME_KEY_MOD_NEW_WINDOW, NULL },

Why?