MAGETWO-55301: Enable tax rate calculation on address change without shipping methods

Author: pdohogne-magento

app/code/Magento/Checkout/view/frontend/web/js/model/cart/estimate-service.js

@@ -22,7 +22,7 @@ define([
         if (
             quote.isVirtual() ||
             window.checkoutConfig.activeCarriers &&
-            window.checkoutConfig.activeCarriers.length() === 0 &&
+            window.checkoutConfig.activeCarriers.length === 0 &&
             quote.shippingAddress().isEditable()
         ) {
             // update totals block when estimated address was set