Remove not-so-well working memusage

include/admin/plugins.inc.php

@@ -493,10 +493,12 @@ if (isset($_GET['serendipity']['plugin_to_conf'])) {
     <?php serendipity_plugin_api::hook_event('backend_plugins_event_header', $serendipity); ?>
     <?php show_plugins(true); ?>
 
+    <?php if (count($serendipity['memSnaps']) > 0) { ?>
     <h3>Memory Usage</h3>
     <div>
         <pre><?php print_r($serendipity['memSnaps']); ?></pre>
     </div>
+    <?php } ?>
 <?php
 }
 /* vim: set sts=4 ts=4 expandtab : */