Check ckeditor if defined

app/assets/javascripts/frameworks/main.js.erb

@@ -28,6 +28,7 @@ Copyright (c) 2003-2011, CKSource - Frederico Knabben. All rights reserved.
 For licensing, see LICENSE.html or http://ckeditor.com/license
 */
 
+if (CKEDITOR) {
 CKEDITOR.editorConfig = function( config )
 {
     // Define changes to default configuration here. For example:
@@ -115,3 +116,4 @@ CKEDITOR.editorConfig = function( config )
         }
     });
 };
+}