From 1a18262fd538015c456da2a6706b12a50090761d Mon Sep 17 00:00:00 2001
From: Peter Wilson <wilson@peterwilson.cc>
Date: Tue, 24 Jan 2017 23:29:42 +0000
Subject: [PATCH] Menus: Prevent notice thrown in class-walker-page.php.

Calling `Walker_Page::walk()` directly was causing an `Undefined index: item_spacing` notice to be thrown, this adds an `isset()` check to prevent it.

Props bhargavbhandari90.
Fixes #39564.

Built from https://develop.svn.wordpress.org/trunk@39949


git-svn-id: http://core.svn.wordpress.org/trunk@39886 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-includes/class-walker-page.php | 8 ++++----
 wp-includes/version.php           | 2 +-
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/wp-includes/class-walker-page.php b/wp-includes/class-walker-page.php
index 3fcaa67a86..30831bbc8a 100644
--- a/wp-includes/class-walker-page.php
+++ b/wp-includes/class-walker-page.php
@@ -53,7 +53,7 @@ class Walker_Page extends Walker {
 	 *                       Default empty array.
 	 */
 	public function start_lvl( &$output, $depth = 0, $args = array() ) {
-		if ( 'preserve' === $args['item_spacing'] ) {
+		if ( isset( $args['item_spacing'] ) && 'preserve' === $args['item_spacing'] ) {
 			$t = "\t";
 			$n = "\n";
 		} else {
@@ -78,7 +78,7 @@ class Walker_Page extends Walker {
 	 *                       Default empty array.
 	 */
 	public function end_lvl( &$output, $depth = 0, $args = array() ) {
-		if ( 'preserve' === $args['item_spacing'] ) {
+		if ( isset( $args['item_spacing'] ) && 'preserve' === $args['item_spacing'] ) {
 			$t = "\t";
 			$n = "\n";
 		} else {
@@ -103,7 +103,7 @@ class Walker_Page extends Walker {
 	 * @param int     $current_page Optional. Page ID. Default 0.
 	 */
 	public function start_el( &$output, $page, $depth = 0, $args = array(), $current_page = 0 ) {
-		if ( 'preserve' === $args['item_spacing'] ) {
+		if ( isset( $args['item_spacing'] ) && 'preserve' === $args['item_spacing'] ) {
 			$t = "\t";
 			$n = "\n";
 		} else {
@@ -196,7 +196,7 @@ class Walker_Page extends Walker {
 	 * @param array   $args   Optional. Array of arguments. Default empty array.
 	 */
 	public function end_el( &$output, $page, $depth = 0, $args = array() ) {
-		if ( 'preserve' === $args['item_spacing'] ) {
+		if ( isset( $args['item_spacing'] ) && 'preserve' === $args['item_spacing'] ) {
 			$t = "\t";
 			$n = "\n";
 		} else {
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 20c0f55385..1ada79fbc2 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.8-alpha-39948';
+$wp_version = '4.8-alpha-39949';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.