build: don't strip 'use strict'

[fnpeditor.git] / src / smartxml / smartxml.js

diff --git a/src/smartxml/smartxml.js b/src/smartxml/smartxml.js
index d9e44be..d42dcbf 100644 (file)
--- a/src/smartxml/smartxml.js
+++ b/src/smartxml/smartxml.js
@@ -276,6 +276,9 @@ $.extend(Document.prototype, Backbone.Events, {
                     /* globals document */
                     from = document.createTextNode(from.text);
                 } else {
+                    if(!from.tagName) {
+                        throw new Error('tagName missing');
+                    }
                     var node = $('<' + from.tagName + '>');
 
                     _.keys(from.attrs || {}).forEach(function(key) {
@@ -509,8 +512,10 @@ $.extend(Document.prototype, Backbone.Events, {
             throw new Error('End of transaction requested, but there is no transaction in progress!');
         }
         this._transactionInProgress = false;
-        this.undoStack.push(this._transactionStack);
-        this._transactionStack = [];
+        if(this._transactionStack.length) {
+            this.undoStack.push(this._transactionStack);
+            this._transactionStack = [];
+        }
     },
 
     getNodeByPath: function(path) {