No form validate on nodequeue_generate

On the form to generate nodequeue's, if you do not select a queue, you get a DB error because it expects a queue id to be passed in. I added this validate function to make sure the user select at least one queue.

/**
 * Validate nodequeue generate form submission.
 *
 * Check to make sure a queue was selected.
 */
function nodequeue_generate_form_validate($form, &$form_state) {
	$qids = array_keys(array_filter($form_state['values']['nodequeues']));
	if (count($qids) < 1) {
		 form_set_error('nodequeues', t('You must select a Queue.'));
	}
}