jstl not working for me

I have this code in my jsp (ought to look familiar, i think i robbed it 
from app-crud at one point)

         <logic:present name="header">
            <tr>
            <logic:iterate id="eachHeader" name="header" property="nested">
               <td>
               <logic:present name="eachHeader" property="attributes.sort">
                 <keel:command link="true" name="eachHeader" 
property="attributes.sort">
                 <strong><bean:write name="eachHeader"/></strong>
                 </keel:command>
               </logic:present>

               <logic:notPresent name="eachHeader" 
property="attributes.sort">
               	<strong><bean:write name="eachHeader"/></strong>
               </logic:notPresent>
               </td>
            </logic:iterate>
            </tr>
         </logic:present>

That produces the desired results.

Adding the following directly beneath in the same page produces the 
empty output.  Any suggestions?

	<c:if test="${! empty header}">
            <tr>
	   <c:if test="${! empty header.map['nested']}">
	   not empty
	   </c:if>
	   <c:if test="${empty header.map['nested']}">
	   empty
	   </c:if>
  	   </tr>
	</c:if>
I also tried with header.map.nested, as in the menubar.jsp, with the 
same results.  the struts tags above can find the outputs, can you see 
what I'm doing wrong with the jstl?

TIA
gene
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