[Wordpress] Display just the newest sticky post, if none return nothing

index.php

<?php
	/* Get all Sticky Posts */
	$sticky = get_option( 'sticky_posts' );
?>

<?php if ( !empty($sticky) ) : ?>

	<?php
		/* Sort Sticky Posts, newest at the top */
		rsort( $sticky );

		/* Get top 1 Sticky Post */
		$sticky = array_slice( $sticky, 0, 1 );

		$args = array(
			'posts_per_page' => 1,
			'post__in'  => $sticky,
			'ignore_sticky_posts' => 1
		);

		/* Query Sticky Posts */
		$query = new WP_Query( $args );
	?>

	<?php while ( $query->have_posts() ) : $query->the_post(); ?>

		<?php $classes = get_post_class(); ?>

		<div id="post-<?php echo get_the_id(); ?>" class="<?php echo implode(' ', $classes); ?>">
			<?php echo get_the_content(); ?>
		</div>

	<?php endwhile; ?>

<?php endif; ?>

<?php wp_reset_postdata(); ?>