Add Default Value to $qids in nodequeue_load_queues

When adding node to queue manualy(in code) some time i receive warning.
This warning raised by calling nodequeue_load_queues() function with NULL argument somewhere from nodequeue.actions.inc.

Proposition: add next lines to start nodequeue_load_queues() function:

if (!is_array($qids)) {
$qids = array();
}