404 header on empty threads

[vbresults]

Create a plugin hook on the `init_startup` hook, place the following code in, and save.

PHP Code:

if (THIS_SCRIPT == 'showthread' && !verify_id('threadid', $_GET['t'], false)) {
    header('HTTP/1.0 404 Not Found');
    header('Status: 404 Not Found');
}