Just check if the field is populated with PHP:
<div class="pricelist"><?php $rows = get_field('price_list');
if($rows)
{
echo '<ul class="leaders">';
foreach($rows as $row)
{
echo '<li><span class="service">' . $row['product_or_service'] . '</span> <span class="price"> ' . $row['price'] .'</span></li>';
if( $row['description']) echo '<p class="description"> ' . $row['description'] .'</p>';
}
echo '</ul>';
} ?>
</div>