docs: protected boolean isOperationOnFolder() {
  
          Iterator<String> i = getResourceList().iterator();
          while (i.hasNext()) {
              String resName = i.next();
              try {
                  CmsResource curRes = getCms().readResource(resName, CmsResourceFilter.ALL);
                  if (curRes.isFolder()) {
                      // found a folder
                      return true;
                  }
              } catch (CmsException e) {
                  // can usually be ignored
                  if (LOG.isInfoEnabled()) {
                      LOG.info(e.getLocalizedMessage());
                  }
              }
          }
          return false;
      }