<?php
    $testArray = get_pages(array(
      'child_of' => get_the_ID()
    ));

    if ($theParent or $testArray) { ?>
    <div class="page-links">
      <h2 class="page-links__title"><a href="<?php echo get_permalink($theParent); ?>"><?php echo get_the_title($theParent); ?></a></h2>
      <ul class="min-list">
        <?php
          if ($theParent) {
            $findChildrenOf = $theParent;
          } else {
            $findChildrenOf = get_the_ID();
          }

          wp_list_pages(array(
            'title_li' => NULL,
            'child_of' => $findChildrenOf,
            'sort_column' => 'menu_order'
          ));
        ?>
      </ul>
    </div>
    <?php } ?>