Solved swagger response of product attribute option is_default

Author: hiren

app/code/Magento/Directory/Model/ResourceModel/Country/Collection.php

@@ -327,7 +327,7 @@ private function addDefaultCountryToOptions(array &$options)
 
         foreach ($options as $key => $option) {
             if (isset($defaultCountry[$option['value']])) {
-                $options[$key]['is_default'] = $defaultCountry[$option['value']];
+                $options[$key]['is_default'] = !empty($defaultCountry[$option['value']]);
             }
         }
     }