suppress errors when trying to load a non existant plugin

Ignore-this: 21eafbc145c8abfeb8450d9a1234bae1

darcs-hash:20090216180324-7ad00-2628f381cee27f24f120016a970aabca7d853c7c.gz

inc/plugincontroller.class.php

@@ -79,7 +79,7 @@ class Doku_Plugin_Controller {
     $dir = $this->get_directory($plugin);
     $file = $component ? "$type/$component.php" : "$type.php";
 
-    if (!include_once(DOKU_PLUGIN."$dir/$file")) {
+    if (!@include_once(DOKU_PLUGIN."$dir/$file")) {
       return null;
     }