ENGCOM-5402: 23424: fixed search with 0 #23427

 - Merge Pull Request #23427 from jeysmook/magento2:23424_search_with_0
 - Merged commits:
   1. 36190fb
   2. a8f5c0d
   3. dfd664e

Author: magento-engcom-team

app/code/Magento/CatalogSearch/Ui/DataProvider/Product/AddFulltextFilterToCollection.php

@@ -5,8 +5,8 @@
  */
 namespace Magento\CatalogSearch\Ui\DataProvider\Product;
 
-use Magento\Framework\Data\Collection;
 use Magento\CatalogSearch\Model\ResourceModel\Search\Collection as SearchCollection;
+use Magento\Framework\Data\Collection;
 use Magento\Ui\DataProvider\AddFilterToCollectionInterface;
 
 /**
@@ -30,14 +30,14 @@ public function __construct(SearchCollection $searchCollection)
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritdoc
      *
      * @SuppressWarnings(PHPMD.UnusedFormalParameter)
      */
     public function addFilter(Collection $collection, $field, $condition = null)
     {
         /** @var $collection \Magento\Catalog\Model\ResourceModel\Product\Collection */
-        if (isset($condition['fulltext']) && !empty($condition['fulltext'])) {
+        if (isset($condition['fulltext']) && (string)$condition['fulltext'] !== '') {
             $this->searchCollection->addBackendSearchFilter($condition['fulltext']);
             $productIds = $this->searchCollection->load()->getAllIds();
             $collection->addIdFilter($productIds);

app/code/Magento/Ui/Component/Filters/Type/Search.php

@@ -6,6 +6,8 @@
 namespace Magento\Ui\Component\Filters\Type;
 
 /**
+ * Class Search
+ *
  * @api
  * @since 100.0.2
  */
@@ -34,7 +36,7 @@ protected function applyFilter()
     {
         $value = $this->getContext()->getRequestParam('search');
 
-        if ($value) {
+        if ((string)$value !== '') {
             $filter = $this->filterBuilder->setConditionType('fulltext')
                 ->setField($this->getName())
                 ->setValue($value)