Index.php

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<?php
namespace Magento\Wishlist\Controller\Index;

use Magento\Framework\App\Action;
use Magento\Framework\Exception\NotFoundException;
use Magento\Framework\Controller\ResultFactory;

class Index extends \Magento\Wishlist\Controller\AbstractIndex
{
    protected $wishlistProvider;

    public function __construct(
        Action\Context $context,
        \Magento\Wishlist\Controller\WishlistProviderInterface $wishlistProvider
    ) {
        $this->wishlistProvider = $wishlistProvider;
        parent::__construct($context);
    }

    public function execute()
    {
        if (!$this->wishlistProvider->getWishlist()) {
            throw new NotFoundException(__('Page not found.'));
        }
        $resultPage = $this->resultFactory->create(ResultFactory::TYPE_PAGE);
        return $resultPage;
    }
}