Remove Category Uncategorized from Wordpress Loop

Remove Category Uncategorized from Wordpress Loop

I want to list all post from a custom post type by category so I came up
with this code (see below) but them I see this uncategorized category I
want to remove. I tried in the query
cat=$cat_id&exclude="1"&post_type=locations but it's not working. Any
ideas? Thank You
<?php
$cats = get_categories();
foreach ($cats as $cat) {
$cat_id= $cat->term_id;
echo "<h2>".$cat->name."</h2>";
query_posts("cat=$cat_id&exclude="1"&post_type=locations");
if (have_posts()) : while (have_posts()) : the_post(); ?>
<?php ?>
<a href="<?php the_permalink();?>"><?php the_title(); ?></a>
<?php echo '<hr/>'; ?>
<?php endwhile; endif; ?>
<?php } ?>
<?php wp_reset_postdata(); ?>
</div><!-- .entry-content -->