MC-34363: Admin panel place order with empty CC (Braintree) values

Author: tsviklinskyi

app/code/Magento/Braintree/view/adminhtml/web/js/braintree.js

@@ -304,6 +304,9 @@ define([
             }
 
             if (!self.validateCardType()) {
+                $('body').trigger('processStop');
+                self.error($t('Some payment input fields are invalid.'));
+
                 return false;
             }