Same function refactored using the "Return Early Pattern" - now when the conditions will not let the function continue, we get out of the function right away

post.php

function genesis_do_post_image() {

	if ( is_singular() || ! genesis_get_option( 'content_archive_thumbnail' ) ) {
		return;
	}

	$img = genesis_get_image( array(
		'format'  => 'html',
		'size'    => genesis_get_option( 'image_size' ),
		'context' => 'archive',
		'attr'    => genesis_parse_attr( 'entry-image', array ( 'alt' => get_the_title() ) ),
	) );

	if ( empty( $img ) ) {
		return;
	}

	genesis_markup( array(
        'html5'   => '<a %s>',
        'xhtml'   => '<a href="' . get_permalink() . '" class="entry-image-link" aria-hidden="true">',
        'context' => 'entry-image-link'
    ));

    echo $img . '</a>';

}