fix ProductIndexIndexBuilder

@@ -170,6 +170,9 @@ public class ProductIndexIndexBuilder extends IIndexBuilder implements Applicati
             BeanUtils.copyProperties(productIBO, productIndexBO);
             productIndexBOs.add(productIndexBO);
         }
+        if(productIndexBOs==null || productIndexBOs.isEmpty()){
+        	return productIndexBOs;
+        }
         //调用每个viewBuilder构建ProductIndexBO的各种属性数据
         viewBuilderList.stream().forEach(viewBuilder -> {
             viewBuilder.build(productIndexBOs, idList, sknList);