From a32a75b9f461055820e904548c6da1a4a1f81156 Mon Sep 17 00:00:00 2001
From: Sergey Biryukov <sergeybiryukov.ru@gmail.com>
Date: Thu, 11 Sep 2014 13:56:15 +0000
Subject: [PATCH] XML-RPC: Check if category support was added for pages before
 calling wp_get_post_categories() to avoid unnecessary query in wp.getPage.

props markoheijnen, nprasath002.
fixes #17920.
Built from https://develop.svn.wordpress.org/trunk@29731


git-svn-id: http://core.svn.wordpress.org/trunk@29505 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-includes/class-wp-xmlrpc-server.php | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/wp-includes/class-wp-xmlrpc-server.php b/wp-includes/class-wp-xmlrpc-server.php
index 4ea5df60f8..3a792c21bb 100644
--- a/wp-includes/class-wp-xmlrpc-server.php
+++ b/wp-includes/class-wp-xmlrpc-server.php
@@ -911,8 +911,10 @@ class wp_xmlrpc_server extends IXR_Server {
 
 		// Pull the categories info together.
 		$categories = array();
-		foreach ( wp_get_post_categories( $page->ID ) as $cat_id ) {
-			$categories[] = get_cat_name( $cat_id );
+		if ( is_object_in_taxonomy( 'page', 'category' ) ) {
+			foreach ( wp_get_post_categories( $page->ID ) as $cat_id ) {
+				$categories[] = get_cat_name( $cat_id );
+			}
 		}
 
 		// Get the author info.