Use this type of technique, so you set a token if there are results and the panel showing the table will display (depends=) and the panel showing the message will not display (rejects=)
<table depends="$has_results$">
<search>
<query>
Your search
</query>
</search>
<done>
eval token="has_results">if($job.resultCount$>0, 1, null())</eval>
</done>
</table>
<html rejects="$has_results$">
<h1>There are no results</h1>
</html>
