* @throws EmptyVariableException Thrown if given controller is not set
* @throws DefaultControllerException Thrown if default controller was not found
*/
public function isControllerValid ($controllerName) {
// By default nothing shall be valid
* @throws EmptyVariableException Thrown if given controller is not set
* @throws DefaultControllerException Thrown if default controller was not found
*/
public function isControllerValid ($controllerName) {
// By default nothing shall be valid