When validating postcode exit early in the update function if the 'option' is...

When validating postcode exit early in the update function if the 'option' is undefined. This can happen with stores that have a different deault country than US

app/code/Magento/Ui/view/base/web/js/form/element/region.js

@@ -35,6 +35,11 @@ define([
                 return;
             }
             option = options[value];
+
+            if (typeof option === 'undefined') {
+                return;
+            }
+
             defaultPostCodeResolver.setUseDefaultPostCode(!option['is_zipcode_optional']);
 
             if (this.skipValidation) {