php - Getting NULL in template - OpenCart 2.0 -

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i trying render product_list.tpl file in home.tpl it's giving me null

controller file:

/controller/product/product_list.php

code: 

class controllerproductproductlist extends controller {     public function index() {          $this->load->model('catalog/category');          $this->load->model('catalog/product');          $this->load->model('tool/image');          $filter_data = array(                 'filter_tag'          => 'featured',                 'limit'               => 9             );         $data['results'] = $this->model_catalog_product->getproducts($filter_data);         if (file_exists(dir_template . $this->config->get('config_template') . '/template/common/productlist.tpl')) {             $this->response->setoutput($this->load->view($this->config->get('config_template') . '/template/common/productlist.tpl', $data));         } else {             $this->response->setoutput($this->load->view('default/template/common/productlist.tpl', $data));         }     } }

template render

/template/product/productlist.tpl

code:

<?php var_dump($results); ?> <h2>product here</h2>

then adding line in home.php controller

$data['special_mod'] = $this->load->controller('product/product_list');

and printing $special_mod in common/home.tpl file

the problem in /controller/product/product_list.php

the method $this->response->setoutput doesn't return value send user different page while wanted output productlist.tpl string had replace code

if (file_exists(dir_template . $this->config->get('config_template') . '/template/common/productlist.tpl')) {             $this->response->setoutput($this->load->view($this->config->get('config_template') . '/template/common/productlist.tpl', $data));         } else {             $this->response->setoutput($this->load->view('default/template/common/productlist.tpl', $data));         }

with

if (file_exists(dir_template . $this->config->get('config_template') . '/template/common/productlist.tpl')) {             return $this->load->view($this->config->get('config_template') . '/template/common/productlist.tpl', $data);         } else {             return $this->load->view('default/template/common/productlist.tpl', $data);         }

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