Print a warning when trying to use not existing component type

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "grapesjs",
-  "version": "0.14.59",
+  "version": "0.14.60",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {

package.json

@@ -1,7 +1,7 @@
 {
   "name": "grapesjs",
   "description": "Free and Open Source Web Builder Framework",
-  "version": "0.14.59",
+  "version": "0.14.60",
   "author": "Artur Arseniev",
   "license": "BSD-3-Clause",
   "homepage": "http://grapesjs.com",

src/dom_components/model/Components.js

@@ -9,6 +9,7 @@ module.exports = Backbone.Collection.extend({
     this.listenTo(this, 'add', this.onAdd);
     this.config = opt.config;
     this.em = opt.em;
+    const { em } = this;
 
     this.model = (attrs, options) => {
       var model;
@@ -29,6 +30,11 @@ module.exports = Backbone.Collection.extend({
       if (!model) {
         // get the last one
         model = df[df.length - 1].model;
+        em &&
+          em.logWarning(`Component type '${attrs.type}' not found`, {
+            attrs,
+            options
+          });
       }
 
       return new model(attrs, options);