SwiftOtter-SOP-348 Fix issues with Customer Data when form contains element with name method

Author: lbajsarowicz

app/code/Magento/Customer/view/frontend/web/js/customer-data.js

@@ -429,7 +429,7 @@ define([
     $(document).on('submit', function (event) {
         var sections;
 
-        if (event.target.method.match(/post|put|delete/i)) {
+        if (event.target.hasAttribute('method') && event.target.getAttribute('method').match(/post|put|delete/i)) {
             sections = sectionConfig.getAffectedSections(event.target.action);
 
             if (sections) {