Fixes content getting deleted when saving an RTE before it's fully loaded.

src/Umbraco.Web.UI.Client/src/views/propertyeditors/rte/rte.controller.js

@@ -377,7 +377,9 @@ angular.module("umbraco")
                 var unsubscribe = $scope.$on("formSubmitting", function () {
                     //TODO: Here we should parse out the macro rendered content so we can save on a lot of bytes in data xfer
                     // we do parse it out on the server side but would be nice to do that on the client side before as well.
-                    $scope.model.value = tinyMceEditor ? tinyMceEditor.getContent() : null;
+                    if (tinyMceEditor !== undefined && tinyMceEditor != null) {
+                        $scope.model.value = tinyMceEditor.getContent();
+                    }
                 });
 
                 //when the element is disposed we need to unsubscribe!