avoid an exception when trying to display Help

Lib/Help.php

@@ -7,7 +7,11 @@ use BSR\Lib\Formatter\Html;
 
 class Help {
     private static function func($ws, $func) {
+        try {
             $rm = new \ReflectionMethod($ws, $func);
+        } catch(\ReflectionException $e) {
+            return '';
+        }
 
         $doc = $rm->getDocComment();
         $params = $rm->getParameters();