[common] debug plugins loading

apps/common/main/lib/controller/Plugins.js

@@ -593,6 +593,7 @@ define([
         },
 
         getAppConfigPlugins: function (config) {
+            if ( config.UIpluginsData ) {
                 var me = this;
                 Promise.all(config.UIpluginsData.map(function(url) {
                     return fetch(url)
@@ -614,6 +615,7 @@ define([
                 }).catch(function(e) {
                     console.log('error: ' + e.message);
                 });
+            }
         },
 
     }, Common.Controllers.Plugins || {}));