处理list为空，从数据库取数据时报错的问题。

src/main/java/com/uas/platform/b2c/prod/commodity/service/impl/ProductServiceImpl.java

@@ -2550,6 +2550,9 @@ public class ProductServiceImpl implements ProductService {
             for (String id : splits) {
                 idList.add(Long.valueOf(id));
             }
+            if (CollectionUtils.isEmpty(idList)) {
+                return new ArrayList<>();
+            }
             return productDao.findAll(idList);
         }
     }