code: @Override
      public void scanDirectoryNoResults(
              File directory, FileFilter fileFilter, Function<Resource, ?> fileProcessor) {
          this.scanDirectory(directory, null, fileFilter, fileProcessor);
      }
docs: /* (non-Javadoc)
  @see org.apereo.portal.utils.DirectoryScanner#scanDirectoryNoResults(java.io.File, java.io.FileFilter, com.google.common.base.Function)