Ignore warnings in the constructor of SimplePie_File

This ignores warnings because of the (intentionally) missing url
parameter for the constructor of SimplePie_File.

inc/FeedParser.php

@@ -49,7 +49,7 @@ class FeedParser_File extends SimplePie_File {
      */
     function FeedParser_File($url, $timeout=10, $redirects=5,
                              $headers=null, $useragent=null, $force_fsockopen=false) {
-        parent::__construct();
+        @parent::__construct();
         $this->http    = new DokuHTTPClient();
         $this->success = $this->http->sendRequest($url);