Proposed fix for Genesis header right widgets

layout.php

function genesis_header_body_classes( array $classes ) {

	if ( current_theme_supports( 'custom-header' ) ) {
		if ( get_theme_support( 'custom-header', 'default-text-color' ) !== get_header_textcolor() || get_theme_support( 'custom-header', 'default-image' ) !== get_header_image() )
			$classes[] = 'custom-header';
	}

	if ( 'image' === genesis_get_option( 'blog_title' ) || ( get_header_image() && ! display_header_text() ) )
		$classes[] = 'header-image';

// Instead of this conditional to set the header-full-width use the one below instead
//	if ( ! is_active_sidebar( 'header-right' ) && ! has_action( 'genesis_header_right' ) )
//		$classes[] = 'header-full-width';

	if ( ! genesis_is_header_right_ok_to_render() ) {
		$classes[] = 'header-full-width';
	}

	return $classes;

}

sidebar.php

/**
 * Checks if the `header-right` sidebar is ready to render, meaning it has either of these states: 
 *      1. registered and has at least one widget in it
 *      2. `genesis_header_right` has an action registered to it.
 *
 * @since 1.0.0
 *
 * @return bool
 */
function genesis_is_header_right_ok_to_render() {
	global $wp_registered_sidebars;

	return ( isset( $wp_registered_sidebars['header-right'] ) && is_active_sidebar( 'header-right' ) ) || 
	       has_action( 'genesis_header_right' );
}

Here is the scenario:

1. Current theme has header right sidebar in it and widgets are active.
2. Unregister the header right sidebar, we do not get 'header-full-width' because the widgets are active.

It needs an additional check to see if the sidebar is even registered.