code: public String getSitePath(CmsObject cms) {
  
          if (m_path != null) {
              return m_path;
          } else if (m_folder != null) {
              return cms.getRequestContext().removeSiteRoot(m_folder.getRootPath());
          }
          return null;
      }
docs: Computes the site path of the folder, which is either the original path constructor argument, or the site
  path of the original resource constructor argument.<p>
  
  @param cms the current CMS context
  @return the site path of the lazy folder