filter out “uncategorized” from all category listings with one filter in functions.php?

I was finally able to figure this one out… Although I have to set the filter directly on the widget_categories_args method, so it does take two filter statements to do it.

function my_categories_filter($cat_args){
    $cat_args['title_li'] = '';
    $cat_args['exclude_tree'] = 1;
    $cat_args['exclude'] = 1;
    $cat_args['use_desc_for_title'] = 0;
    return $cat_args;
}

add_filter('widget_categories_args', 'my_categories_filter', 10, 2);