apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/component/ItemsComparator.java/ItemsComparator/filterBlankAndCommentItem
class ItemsComparator:  private List<ItemDTO> filterBlankAndCommentItem(List<ItemDTO> items){

    List<ItemDTO> result = new LinkedList<>();

    if (CollectionUtils.isEmpty(items)){
      return result;
    }

    for (ItemDTO item: items){
      if (!StringUtils.isEmpty(item.getKey())){
        result.add(item);
      }
    }

    return result;
  }