If you make a
<?php query_posts('category_name=test'); ?>
before your loop, you will have this error
WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') AND rel_type = 'category' AND (post_type = 'post' AND (post_st]
SELECT SQL_CALC_FOUND_ROWS wp_posts.* FROM wp_posts LEFT JOIN wp_post2cat ON (wp_posts.ID = wp_post2cat.post_id) LEFT JOIN wp_categories ON (wp_post2cat.category_id = wp_categories.cat_ID) WHERE 1=1 AND category_id IN () AND rel_type = 'category' AND (post_type = 'post' AND (post_status = 'publish' OR post_status = 'private')) GROUP BY wp_posts.ID ORDER BY post_date DESC LIMIT 0, 10
Tested on a fresh trunk install
