do not use error supression but check for file existance in plugin controller

Ignore-this: b796ce104bb86a05e8bca1c900ef99d8

darcs-hash:20090220084815-7ad00-74aa7c875606a5dfdbd257caa56bf092152e3019.gz

inc/plugincontroller.class.php

@@ -79,7 +79,11 @@ class Doku_Plugin_Controller {
     $dir = $this->get_directory($plugin);
     $file = $component ? "$type/$component.php" : "$type.php";
 
-    if (!@include_once(DOKU_PLUGIN."$dir/$file")) {
+    if(!is_file(DOKU_PLUGIN."$dir/$file")){
+      return null;
+    }
+
+    if (!include_once(DOKU_PLUGIN."$dir/$file")) {
       return null;
     }