code: @Override
      protected void cleanUp() {
  
          m_pageStorage = null;
          m_folderStorage = null;
          m_webAppNames = null;
          m_webappUrl = null;
          super.cleanUp();
      }
docs: Cleans up member variables after the import is finished.<p>
  
  This is required since there is only one instance for
  each import version that is kept in memory and reused.<p>