debug: Application not abstract

Author: fuyibing

src/Application.php

@@ -2,18 +2,25 @@
 /**
  * 应用入口
  */
+
 namespace Pails;
 
-abstract class Application extends \Phalcon\Mvc\Application
+/**
+ * Class Application
+ * @package Pails
+ */
+class Application extends \Phalcon\Mvc\Application
 {
+
     public function boot()
     {
-        // 注入应用级的服务
-        $this->di->registerServices($this->di->getConfig()->path('app.providers', []));
-
-        // 禁用视图
+        /**
+         * Providers
+         */
+        $providers = $this->di->getConfig()->path('app.providers', []);
+        $providers === null || $this->di->registerServices($providers);
+        // disable views
         $this->useImplicitView(false);
-
         return $this;
     }
-}
+}