Display child terms if there are posts on custom taxonomy template - wordpress

Question

I have a piece of code that shows child terms of a custom taxonomy of the current parent term in the taxonomy-term.php template file. I want to display html only when there are child terms present. Now the heading 2 is displayed even when there are no child terms. Here is the code:
<?php
$term_children = get_terms('onderwerp', array( 'parent' => get_queried_object_id(),));
if ( ! is_wp_error( $terms ) || ($term_children->count != 0) ) { ?>
<section>
<h2>Ik heb een vraag over:</h2>
<div class="onderwerp-links">
<?php
foreach ( $term_children as $child ) { ?>
<?php $img = get_term_meta( $term->term_id, 'ndftm_img', true ); ?>
<a href="<?php echo esc_url( get_term_link( $child ) ) ?>" style="background-image: url(<?php echo $img; ?>)">
<span><?php echo $child->name; ?></span>
</a><?php
}
?>
</div>
</section>
<?php
}
?>

Answer 1

I fixed it by adding
'hide_empty' => true
in the get terms array
and making the if statement like this:
if ( ! empty($term_children) )
Here's the code:
<?php
$term_children = get_terms('onderwerp', array( 'parent' => get_queried_object_id(), 'hide_empty' => true ));
if ( ! empty($term_children) ) { ?>
<section>
<h2>Ik heb een vraag over:</h2>
<div class="onderwerp-links">
<?php
foreach ( $term_children as $child ) { ?>
<?php $img = get_term_meta( $term->term_id, 'ndftm_img', true ); ?>
<a href="<?php echo esc_url( get_term_link( $child ) ) ?>" style="background-image: url(<?php echo $img; ?>)">
<span><?php echo $child->name; ?></span>
</a><?php
}
?>
</div>
</section>
<?php
}
?>