23424: fixed search with 0

Author: jeysmook

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

@@ -37,7 +37,7 @@ public function __construct(SearchCollection $searchCollection)
     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']) && 0 !== strlen($condition['fulltext'])) {
             $this->searchCollection->addBackendSearchFilter($condition['fulltext']);
             $productIds = $this->searchCollection->load()->getAllIds();
             $collection->addIdFilter($productIds);

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

@@ -34,7 +34,7 @@ protected function applyFilter()
     {
         $value = $this->getContext()->getRequestParam('search');
 
-        if ($value) {
+        if (0 !== strlen($value)) {
             $filter = $this->filterBuilder->setConditionType('fulltext')
                 ->setField($this->getName())
                 ->setValue($value)