Seems wp_list_authors will not return a link if a user has no posts (even though it does allude to that in Codex).
In my WordPress 2.0.1 test system, I made this change to the
list_authors function in the
wp-includes/template-functions-author.php file at around line 205
$link = $name;
$link = '<a href="' . 'http://arthouseproject.org/?author=' . $author->ID . '" title="' . sprintf(__("Info about %s"), wp_specialchars($author->display_name)) . '">' . $name . '</a>';
Note: I used your wp_list_authors tag for my test.
Please be advised that changing core script files is not recommended and that you will need to remember these changes in the event you upgrade at a later date!
Another idea is to consider using your Links to link to each author page by getting the link from that author page then pasting it into each Link's URI.