Conditional based on having field values
<?php if(get_field('course_features')): echo '<h3>Features</h3>'; echo '<ul>'; while(has_sub_fields('course_features')): echo '<li>'; $featureitem = get_sub_field('feature_item'); //note get_sub_field after 'while' if ($featureitem) { echo $featureitem; } echo '</li>'; endwhile; echo '</ul>'; endif; ?>