No guarantees, I haven’t actually tested it. LOL 😉
<?php
if( have_rows('repeater_field_name') ):
$repeater_subfield_name = get_sub_field('repeater_subfield_name');
if( !empty($repeater_subfield_name) ):
?>
<h2><?php _e('Title');?></h2> //need to hide this if subfield is empty
<?php endif; ?>
<ul>
<?php while ( have_rows('repeater_field_name') ) : the_row(); ?>
<li><?php echo $repeater_subfield_name ?></li>
<?php endwhile; ?>
</ul>
<?php endif; ?>