MAGETWO-38867: Create mixin for declarative widget description

Author: Ihor Melnychenko

lib/web/mage/apply/main.js

@@ -90,7 +90,7 @@ define([
                 .forEach(function (itemContainer) {
                     var mixins = itemContainer.data.mixins;
 
-                    if(mixins) {
+                    if (mixins) {
                         $.when(itemContainer = initMixins(mixins, itemContainer)).then(_.each(itemContainer.data, init.bind(null, itemContainer.el)));
                     } else {
                         _.each(itemContainer.data, init.bind(null, itemContainer.el));