Supplier Description in Product Tab

[Nikminor]

 I have the following problem. I try to get the supplier description of the specific productsupplier in the product tab on the product page. I use an individual theme.

Therefore i wrote the following codelines: 

In Productcontroler.php

$this->context->smarty->assign(array(
                'priceDisplay' => $priceDisplay,
                'productPriceWithoutReduction' => $productPriceWithoutReduction,
                'customizationFields' => $customization_fields,
                'id_customization' => empty($customization_datas) ? null : $customization_datas[0]['id_customization'],
                'accessories' => $accessories,
                'product' => $product_for_template,
                'displayUnitPrice' => (!empty($this->product->unity) && $this->product->unit_price_ratio > 0.000000) ? true : false,
                'product_manufacturer' => $productManufacturer,
                'manufacturer_image_url' => $manufacturerImageUrl,
                'product_brand_url' => $productBrandUrl,
                'product_supplier' => new Supplier((int)$this->product->id_supplier, $this->context->language->id),

In Product.tpl

 <li class="nav-item">
                    <a class="nav-link" data-toggle="tab" href="{$supplier.description nofilter}">
                      {Supplier::getNameById($product->id_supplier)}

 

The Problem ist the supplier name is displayed in the tab name, but the description is not displayed (See attachment) and the tab does not open. 

I tried to solve it with the following forum entry, but i doesn't work:  https://www.prestashop.com/forums/topic/279912-solved-how-to-show-supplier-description-on-product-page/

I tried everything and don't know how to solve it. Can someone please help me?