taxation decider is now if value exists or not

Author: ajungg

core/src/main/java/io/snabble/sdk/Checkout.java

@@ -290,7 +290,7 @@ public void success(CheckoutApi.SignedCheckoutInfo checkoutInfo,
                                 CheckoutApi.PaymentMethodInfo[] availablePaymentMethods) {
                 signedCheckoutInfo = checkoutInfo;
 
-                if (shoppingCart.getTaxation() == ShoppingCart.Taxation.UNDECIDED && signedCheckoutInfo.isRequiringTaxation()) {
+                if (signedCheckoutInfo.isRequiringTaxation()) {
                     Logger.d("Taxation requested");
                     notifyStateChanged(State.REQUEST_TAXATION);
                     return;

core/src/main/java/io/snabble/sdk/CheckoutApi.java

@@ -63,7 +63,8 @@ public boolean isRequiringTaxation() {
                     JsonArray jsonArray = checkoutInfo.get("requiredInformation").getAsJsonArray();
                     for (JsonElement element : jsonArray) {
                         String id = element.getAsJsonObject().get("id").getAsString();
-                        if (id.equals("taxation")) {
+                        boolean hasValue = element.getAsJsonObject().has("value");
+                        if (id.equals("taxation") && !hasValue) {
                             return true;
                         }
                     }