处理没有商品详情banner的情况

app/Controller/v3/GoodsController.php

@@ -47,6 +47,12 @@ class GoodsController extends BaseController
             $res['detail'] = $this->goodsService->detail($params['goods_id']);
             $res['banner'] = $this->goodsService->getBanner(1572);
         }
+
+        //如果没有banner数据，使用商品cover图
+        if(count($res['banner']) == 0){
+            $res['banner'] = [$res['detail']['cover_img']];
+        }
+
         if(isset($params['user_id'])) {
             $res['shopcart']['count'] = $this->shopCartService->check(111);
             $res['shopcart']['total'] = $this->shopCartService->getTotal();