处理supplier为空

app/Admin/Controllers/OrderController.php

@@ -44,9 +44,9 @@ class OrderController extends AdminController
 						[[
 							$this->title,
 							'<img data-action="preview-img" src="'.$this->picture.'" style="max-width:120px;max-height:200px;cursor:pointer" class="img img-thumbnail">',
-							$this->num,
-							$this->agent->company_name,
-							$this->product->supplier->company_name,
+							$this->num ?? 0,
+							$this->agent->company_name ?? '',
+							$this->product->supplier->company_name ?? '',
 						]]);
 				})->xl();
             $grid->column('paid_money');