Popular.php

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<?php
namespace Magento\Search\Controller\Term;

use Magento\Framework\App\Action\Action;
use Magento\Framework\App\Action\Context;
use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Framework\App\RequestInterface;
use Magento\Store\Model\ScopeInterface;
use Magento\Framework\Controller\ResultFactory;

class Popular extends Action
{
    protected $scopeConfig;

    public function __construct(Context $context, ScopeConfigInterface $scopeConfig)
    {
        $this->scopeConfig = $scopeConfig;
        parent::__construct($context);
    }

    public function dispatch(RequestInterface $request)
    {
        $searchTerms = $this->scopeConfig->getValue(
            'catalog/seo/search_terms',
            ScopeInterface::SCOPE_STORE
        );
        if (!$searchTerms) {
            $this->_redirect('noroute');
            $this->_actionFlag->set('', self::FLAG_NO_DISPATCH, true);
        }
        return parent::dispatch($request);
    }

    public function execute()
    {
        $resultPage = $this->resultFactory->create(ResultFactory::TYPE_PAGE);
        return $resultPage;
    }
}