home.php

<?php
/**
 * Blog Intro
 */

add_action( 'genesis_before_loop', 'rgc_blog_intro' );
/**
 * Add title and content before blog archive loop.
 *
 * @author Robin Cornett
 * @link   https://gist.github.com/robincornett/cca2a45f273b35399bd2
 *
 * @return null Return early if not using a page for posts.
 */
function rgc_blog_intro() {
	$page_for_posts = get_post( get_option( 'page_for_posts' ) );

	if ( is_null( $page_for_posts ) ) {
		return;
	}

	$title   = $page_for_posts->post_title;
	$content = $page_for_posts->post_content;
	
	if ( $title && ! class_exists( 'Display_Featured_Image_Genesis' ) ) {
		echo '<h1 class="archive-title">' . $title . '</h1>';
	}

	if ( $content ) {
		echo '<div class="archive-description">' . wpautop( $content ) . '</div>';
	}
}

genesis();

Is is_null the correct check? a var_dump returns 0, not NULL, if the front page is set to Latest Posts. Doing a if ( ! $posts_page ) is working for me.