fixed test break.

framework/base/Application.php

@@ -207,7 +207,6 @@ abstract class Application extends Module
         }
 
         // merge core components with custom components
-        if (!empty($config['components'])) {
         foreach ($this->coreComponents() as $id => $component) {
             if (!isset($config['components'][$id])) {
                 $config['components'][$id] = $component;
@@ -216,7 +215,6 @@ abstract class Application extends Module
             }
         }
     }
-    }
 
     /**
      * @inheritdoc