Child Category Conditional

I am trying to display images if a child category is selected however when a child category is not selected I want to display a message saying its not available. The below code works to display the images however I cannot seem to correctly add the code that displays message if no child category is selected.

<?php
foreach((get_the_category()) as $childcat) {
if (cat_is_ancestor_of(210, $childcat)) {

echo '<img src="/wp-content/themes/Bootstrap/images/flags/';
echo $childcat->slug;
echo '.png" alt="';
echo $childcat->cat_name;
echo '" title="';
echo $childcat->cat_name;
echo '" style="width:28px;height:20px;border-radius:20px;"> ';

}}
?>

Below is a working conditional however it does not display all the child categories like the code above.

<?php

 if (is_category_or_sub(210)) {

	 echo '<img src="/wp-content/themes/Bootstrap/images/flags/';
echo $childcat->slug;
echo '.png" alt="';
echo $childcat->cat_name;
echo '" title="';
echo $childcat->cat_name;
echo '" style="width:28px;height:20px;border-radius:20px;"> ';

} else {
echo 'Sorry This Movie Is Not Available';
}

 ?>

Here is it in action: https://netflix.rhgfx.com/life-itself/

its the availability column on the left.