From 3f4aba55454f5c27486e208a9517ed1c65ead2a9 Mon Sep 17 00:00:00 2001
From: Ingo Schommer <ingo@silverstripe.com>
Date: Fri, 30 Mar 2012 15:23:39 +0200
Subject: [PATCH] MINOR Avoid breaking IE on CMS ajax responses which don't
 contain CSS class names (splitting on NULL) (#7002)

---
 admin/javascript/LeftAndMain.js | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/admin/javascript/LeftAndMain.js b/admin/javascript/LeftAndMain.js
index b8c77f4f0..a7a502a3d 100644
--- a/admin/javascript/LeftAndMain.js
+++ b/admin/javascript/LeftAndMain.js
@@ -223,12 +223,13 @@ jQuery.noConflict();
 						var layoutClasses = ['east', 'west', 'center', 'north', 'south'];
 						var elemClasses = contentEl.attr('class');
 						
-						var origLayoutClasses = $.grep(
-							elemClasses.split(' '),
-							function(val) { 
-								return ($.inArray(val, layoutClasses) >= 0);
-							}
-						);
+						var origLayoutClasses = '';
+						if(elemClasses) {
+							origLayoutClasses = $.grep(
+								elemClasses.split(' '),
+								function(val) { return ($.inArray(val, layoutClasses) >= 0);}
+							);
+						}
 						
 						newContentEl
 							.removeClass(layoutClasses.join(' '))