docs: protected CmsContainerPageBean removeEmptyContainers(CmsContainerPageBean cntPage) {
  
          List<CmsContainerBean> containers = new ArrayList<CmsContainerBean>();
          for (CmsContainerBean container : cntPage.getContainers().values()) {
              if (container.getElements().size() > 0) {
                  containers.add(container);
              }
          }
          return new CmsContainerPageBean(containers);
      }