how to use logic:Empty within c:forEach

From: PC Leung (leungpingcheung01-public_at_yahoo.com.hk)
Date: 06/30/04 

Date: 30 Jun 2004 08:43:01 -0700

The following coding always return blank values.
If I remove logic tags, it shows values correctly.
How can I use logic:Empty inside c:forEach ?

Thanks

  <c:forEach items="${resultSet.rows}" var="row">
    <tr>
      <td width="20%">
              <logic:empty name="${row.usernm}">
              &nbsp
              </logic:empty>
              <logic:notEmpty name="${row.usernm}">
              ${row.usernm}
              </logic:notEmpty>
      </td>
      <td width="50">
              <logic:empty name="${row.usergrp}">
              &nbsp
              </logic:empty>
              <logic:notEmpty name="${row.usergrp}">
              ${row.usergrp}
              </logic:notEmpty>
      </td>
    </tr>
  </c:forEach>