fix(purchase): 修复创建采购单时供应商信息校验

- 在设置采购信息时增加供应商 ID 的空值和有效性检查
- 如果供应商 ID 为空或无效，返回错误提示信息

app/admin/controller/purchase_product_offer/PurchaseProductOfferController.php

@@ -74,6 +74,9 @@ class PurchaseProductOfferController extends BaseAdminController
     public function setProcureInfo()
     {
         $params = $this->request->post();
+        if($params['supplier_id']=='' ||$params['supplier_id']<=0){
+            return $this->fail('请选择供应商');
+        }
         $params['admin_id']=$this->adminId;
         PurchaseProductOfferLogic::setProcureInfo($params);
         return $this->success('设置成功', [], 1, 1);