修正工单导出报错问题。

application/core/MY_Controller.php

@@ -11,6 +11,7 @@ class Public_Controller extends CI_Controller
         "10" => "安全事件",
         //"20" => "脆弱性",
         //"30" => "残余攻击"
+        "unknown" => "未知类型"
     );
 
     //告警级别