silverstripe-blog/src/Widgets/BlogCategoriesWidgetController.php

<?php

namespace SilverStripe\Blog\Widgets;

if (!class_exists('\\SilverStripe\\Widgets\\Model\\Widget')) {
    return;
}

use SilverStripe\Widgets\Controllers\WidgetController;

class BlogCategoriesWidgetController extends WidgetController
{

}