Toolbar: Prevent PHP deprecation warning in admin bar when node is added with a null parent.

Developed in WordPress/wordpress-develop#11055

Props sky_76, westonruter, ozgursar, sabernhardt.
Fixes #64728.

Built from https://develop.svn.wordpress.org/trunk@61997


git-svn-id: http://core.svn.wordpress.org/trunk@61279 1a063a9b-81f0-0310-95a4-ce76da25c4cd

Author: westonruter

wp-includes/class-wp-admin-bar.php

@@ -169,7 +169,7 @@ public function add_node( $args ) {
 			'my-blogs'               => array( 'my-sites', '3.3' ),
 		);
 
-		if ( isset( $back_compat_parents[ $args['parent'] ] ) ) {
+		if ( is_string( $args['parent'] ) && isset( $back_compat_parents[ $args['parent'] ] ) ) {
 			list( $new_parent, $version ) = $back_compat_parents[ $args['parent'] ];
 			_deprecated_argument( __METHOD__, $version, sprintf( 'Use <code>%s</code> as the parent for the <code>%s</code> admin bar node instead of <code>%s</code>.', $new_parent, $args['id'], $args['parent'] ) );
 			$args['parent'] = $new_parent;

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '7.0-beta5-61996';
+$wp_version = '7.0-beta5-61997';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.