MC-3918: Inputting Text Into WYSIWYG Slows Application Way Down When Multiple WYSIWYG Content Types

- Fix issue when TinyMCE is disabled

Author: davemacaulay

lib/web/mage/adminhtml/wysiwyg/tiny_mce/tinymce4Adapter.js

@@ -127,9 +127,11 @@ define([
          * @param {String} wysiwygId
          */
         removeEvents: function (wysiwygId) {
-            var editor = tinyMceEditors.get(wysiwygId);
+            if (typeof tinyMceEditors !== "undefined") {
+                var editor = tinyMceEditors.get(wysiwygId);
 
-            varienGlobalEvents.removeEventHandler('tinymceChange', editor.onChangeContent);
+                varienGlobalEvents.removeEventHandler('tinymceChange', editor.onChangeContent);
+            }
         },
 
         /**