ENGCOM-5596: Resolve Warning during search in catalog by multiple custom option values. Warning should not be generated in log #23687

 - Merge Pull Request #23687 from edenduong/magento2:2.3-fixbug/warning_log_issue23557
 - Merged commits:
   1. be1e905
   2. ac582d6

Author: magento-engcom-team

app/code/Magento/CatalogSearch/Model/Layer/Filter/Attribute.php

@@ -3,6 +3,8 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento\CatalogSearch\Model\Layer\Filter;
 
 use Magento\Catalog\Model\Layer\Filter\AbstractFilter;
@@ -62,6 +64,9 @@ public function apply(\Magento\Framework\App\RequestInterface $request)
             ->getProductCollection();
         $productCollection->addFieldToFilter($attribute->getAttributeCode(), $attributeValue);
         $label = $this->getOptionText($attributeValue);
+        if (is_array($label)) {
+            $label = implode(',', $label);
+        }
         $this->getLayer()
             ->getState()
             ->addFilter($this->_createItem($label, $attributeValue));