问题件 最终状态不能删选为无的

app/Filters/OrderIssueFilters.php

@@ -412,7 +412,11 @@ class OrderIssueFilters
 
     public function final_status($final_status)
     {
-        $this->queryBuilder->where('order_issues.final_status',$final_status);
+        if($final_status === 'null')
+            $this->queryBuilder->whereNull('order_issues.final_status');
+        else
+            $this->queryBuilder->where('order_issues.final_status',$final_status);
+
     }
 
     public function finance_confirm($finance_confirm)