AC-13596: Catalog Advanced Search with empty data goes to search result page[2.4.dev branch]

Updated advanced search prepareCondition. Add default condition to be false.

Author: sumesh-GL

app/code/Magento/CatalogSearch/Model/ResourceModel/Advanced.php

@@ -1,7 +1,7 @@
 <?php
 /**
- * Copyright © Magento, Inc. All rights reserved.
- * See COPYING.txt for license details.
+ * Copyright 2011 Adobe
+ * All rights reserved.
  */
 namespace Magento\CatalogSearch\Model\ResourceModel;
 
@@ -64,7 +64,7 @@ protected function _construct()
      */
     public function prepareCondition($attribute, $value)
     {
-        $condition = $value;
+        $condition = false;
 
         if (is_array($value)) {
             if ($attribute->getBackendType() == 'varchar') { // multiselect