code: public boolean hasNext(@Nullable AdGroupBidLandscapePage page) {
      if (page == null) {
        return true;
      }
      return getTotalLandscapePointsInPage(page) >= pageSize;
    }
docs: Checks if there is still an ad group bid landscape page left to query.
  
  <p>This method is meant to be used with {@link ServiceQuery#nextPage(AdGroupBidLandscapePage)}.
  The {@code page} is necessary when using DataService, as its paging mechanism is different from
  other services. For details, see
  https://developers.google.com/adwords/api/docs/guides/bid-landscapes#paging_through_results.
  
  @param page the ad group bid landscape page whose total number of landscape points will be used
  to determine if there is still a page left
  @return true if there is still a page left