PHP help

I have a sidebar that changes depending on the page I’m on. If the parent page is Fruit and Oranges and Apples are subpages, then the sidebar will show:
Fruit
-Apples
-Oranges

But if the PArent Page doesnt have any children, a blank box shows up. I was wondering if there was a way to always have the parent page header in there?

Here is the code:

<li class="sidebox">

<?php /* Creates a menu for pages beneath the level of the current page */
if (is_page() and ($notfound != '1')) {
$current_page = $post->ID;
while($current_page) {
$page_query = $wpdb->get_row("SELECT ID, post_title, post_status, post_parent FROM $wpdb->posts WHERE ID = '$current_page'");
$current_page = $page_query->post_parent;
}
$parent_id = $page_query->ID;
$parent_title = $page_query->post_title;

if ($wpdb->get_results("SELECT * FROM $wpdb->posts WHERE post_parent = '$parent_id' AND post_status != 'attachment'")) { ?>

<div class="sb-pagemenu"><h2><?php echo $parent_title; ?> Subpages</h2>

<ul><?php wp_list_pages('sort_column=menu_order&title_li=&child_of='. $parent_id); ?></ul>
<?php if ($parent_id != $post->ID) { ?>
-Back to <a>" ><?php echo $parent_title; ?></a>
<?php } ?>
</div>
<?php } } ?>