修复了在处理class_key和class_value时未检查是否为null的问题

app/common/lists/ListsSearchTrait.php

@@ -23,12 +23,16 @@ trait ListsSearchTrait
         }
         $where = [];
         $class_key=$this->request->__get('class_key');
+        if($class_key!==null){
             foreach($class_key as $key => $value){
                 array_push($search[$key], $value); // 添加class_key的搜索条件
             }
+        }
+
         $class_value=$this->request->__get('class_value'); // 获取class_value的值
-        if($class_value){
+        if($class_value!==null){
             $this->params=array_merge($this->params,$class_value);
+
         }
         foreach ($search as $whereType => $whereFields) {
             switch ($whereType) {