修正Input类

Think/Input.php

@@ -64,7 +64,7 @@ class Input {
             foreach($filters as $filter){
                 if(is_callable($filter)) {
                     $data   =   is_array($data)?array_map($filter,$data):$filter($data); // 参数过滤
-                }else{
+                }elseif(!empty($filter)){
                     $data   =   filter_var($data,is_int($filter)?$filter:filter_id($filter));
                     if(false === $data) {
                         return	 isset($args[2])?$args[2]:NULL;