Update updateAttributes, prevent a crash with an empty attribute

package.json

@@ -1,7 +1,7 @@
 {
   "name": "grapesjs",
   "description": "Free and Open Source Web Builder Framework",
-  "version": "0.9.48",
+  "version": "0.9.49",
   "author": "Artur Arseniev",
   "license": "BSD-3-Clause",
   "homepage": "http://grapesjs.com",

src/dom_components/view/ComponentView.js

@@ -152,8 +152,9 @@ module.exports = Backbone.View.extend({
     var attributes = {},
       attr = model.get("attributes");
     for(var key in attr) {
-        if(attr.hasOwnProperty(key))
+        if (key && attr.hasOwnProperty(key)) {
           attributes[key] = attr[key];
+        }
     }
 
     // Update src