code: public boolean isGroupGuests(String groupName) {
  
          if (CmsStringUtil.isEmptyOrWhitespaceOnly(groupName)) {
              return false;
          }
          return m_groupGuests.equals(groupName) || groupName.endsWith(CmsOrganizationalUnit.SEPARATOR + m_groupGuests);
      }
docs: Checks if a given group name is the name of the guests group.<p>
  
  @param groupName the group name to check
  
  @return <code>true</code> if a given group name is the name of the guests group