Patched deep routing within groups
Associated with the case presented by #715, right now the Routing doesn't support Deep Grouping, aka grouping the Routes until one of them come to have an empty "route" parameter. For example:
Router::group('admin', function() {
Router::any('', 'App\Controllers\Admin\Dashboard@index');
...
});
This PR fix the behavior and permit to have that Deep Grouping.