jar does not support whenempty

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@293151 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/CoreTasks/jar.html

@@ -155,11 +155,6 @@ to a value other than its default, <code>&quot;add&quot;</code>.</b></p>
       the destination file if it already exists.  Default is &quot;false&quot;.</td>
     <td valign="top" align="center">No</td>
   </tr>
-  <tr>
-    <td valign="top">whenempty</td>
-    <td valign="top">behavior when no files match.  Valid values are &quot;fail&quot;, &quot;skip&quot;, and &quot;create&quot;.  Default is &quot;skip&quot;.</td>
-    <td valign="top" align="center">No</td>
-  </tr>
   <tr>
     <td valign="top">duplicate</td>
     <td valign="top">behavior when a duplicate file is found.  Valid values are &quot;add&quot;, &quot;preserve&quot;, and &quot;fail&quot;.  The default value is &quot;add&quot;.  </td>