Accept Merge Request #2104: (release/release_2.13 -> develop)

Merge Request: 处理特殊表面工艺采购单确认报错的问题

Created By: @胡尧
Accepted By: @胡尧
URL: https://jikimo-hn.coding.net/p/jikimo_sfs/d/jikimo_sf/git/merge/2104?initial=true

sf_manufacturing/models/purchase_order.py

@@ -99,7 +99,7 @@ class PurchaseOrder(models.Model):
         res = super(PurchaseOrder, self).button_confirm()
         for line in self.order_line:
             # 将产品不追踪序列号的行项目设置qty_done
-            if line.move_ids[0].product_id.tracking == 'none':
+            if line.move_ids and line.move_ids[0].product_id.tracking == 'none':
                 line.move_ids[0].quantity_done = line.move_ids[0].product_qty
         return res