From a8a7468a9ac6a29fb976309ab41312c22e475c1b Mon Sep 17 00:00:00 2001
From: Andrew Ozz <azaozz@git.wordpress.org>
Date: Wed, 27 Aug 2014 18:22:51 +0000
Subject: [PATCH] TinyMCE wpView: fix 'undefined' head when not adding more
 stylesheets to the sandbox iframe, fixes #29399

git-svn-id: https://develop.svn.wordpress.org/trunk@29649 602fd350-edb4-49c9-b593-d223f7449a82
---
 src/wp-includes/js/mce-view.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/wp-includes/js/mce-view.js b/src/wp-includes/js/mce-view.js
index 1632d7daba..85484ef42b 100644
--- a/src/wp-includes/js/mce-view.js
+++ b/src/wp-includes/js/mce-view.js
@@ -135,6 +135,7 @@ window.wp = window.wp || {};
 						iframe, iframeDoc, i, resize;
 
 					content.innerHTML = '';
+					head = head || '';
 
 					if ( importStyles ) {
 						if ( ! wp.mce.views.sandboxStyles ) {