Screen API: After [37972], ensure that `$box['args']` is an array before trying to access `__widget_basename`.

This prevents a PHP fatal error on the Nav Menus screen where `$args` is an object.

Props elrae.
Fixes #35021.
Built from https://develop.svn.wordpress.org/trunk@38004


git-svn-id: http://core.svn.wordpress.org/trunk@37945 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/screen.php

@@ -120,7 +120,7 @@ function meta_box_prefs( $screen ) {
 
 				$widget_title = $box['title'];
 
-				if ( isset( $box['args']['__widget_basename'] ) ) {
+				if ( is_array( $box['args'] ) && isset( $box['args']['__widget_basename'] ) ) {
 					$widget_title = $box['args']['__widget_basename'];
 				}
 

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.6-beta2-38003';
+$wp_version = '4.6-beta2-38004';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.