docs: public CmsGroupContainerBean getGroupContainer(CmsObject cms) {
  
          if (m_groupContainers.containsKey(CmsLocaleManager.MASTER_LOCALE)) {
              return m_groupContainers.get(CmsLocaleManager.MASTER_LOCALE);
          } else if (!m_groupContainers.isEmpty()) {
              return m_groupContainers.get(m_groupContainers.keySet().iterator().next());
          } else {
              return null;
          }
      }