old_status增加isset判断

app/AdminAgent/Controllers/OrderController.php

@@ -68,7 +68,7 @@ class OrderController extends AdminController
 					$refund_info = [
 						'退款单号' => $this->refund_info['refund_no'] ?? '',
 						'退款说明' => $this->refund_info['desc'] ?? '',
-						'退款前状态' => $this->refund_info['old_status'] ? OrderStatus::array()[$this->refund_info['old_status']] : '',
+						'退款前状态' => isset($this->refund_info['old_status']) ? OrderStatus::array()[$this->refund_info['old_status']] : '',
 						'退款凭据' => $html,
 					];
 					return Table::make($refund_info);