Hiding custom fields when content is empty [closed]

Got it!

I needed to add this line:

if ( $other_details = get_post_meta( $order->id, 'Other Details', true ) ) {

So the full code for the block I needed to change would be:

/**
 * Add the fields to order confirmation/thank you page.
 **/

 add_action( 'woocommerce_order_details_after_order_table', "my_woocommerce_other_details_after_order_table", 10, 1 );

function my_woocommerce_other_details_after_order_table( $order ) {

 if ($other_details = get_post_meta( $order->id, 'Other Details', true ) ) {

echo '<p><strong>'.__('Other Details').':</strong> ' . get_post_meta( $order->id, 'Other Details', true ) . '</p>';

    }

}