Fixed busines parameter check again

src/Utils/LuBusiness.php

      */
     public static function checkParam($param, $validate = null)
     {
-        if (!self::hasParam($param))
+        if (!self::hasParam(array($param)))
             abort(400, 'Missing parameter: ' . $param);
         $value = self::getParam($param);
         if ($validate != null) {