show 0 price for explicit 0 priced items

Author: ajungg

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

@@ -14,7 +14,11 @@ public PriceFormatter(Project project) {
     }
 
     public String format(int price) {
-        if (price == 0) {
+        return format(price, true);
+    }
+
+    public String format(int price, boolean allowZeroPrice) {
+        if (price == 0 && !allowZeroPrice) {
             return "";
         }
 
@@ -63,7 +67,7 @@ public String format(Product product, boolean discountedPrice, ScannedCode scann
             price = scannedCode.getPrice();
         }
 
-        String formattedString = format(price);
+        String formattedString = format(price, false);
         Product.Type type = product.getType();
 
         Unit referenceUnit = product.getReferenceUnit();

ui/src/main/java/io/snabble/sdk/ui/cart/ShoppingCartView.java

@@ -486,7 +486,7 @@ public void bindTo(final int position) {
                     priceTextView.setText(" " + priceFormatter.format(embeddedPrice));
                 } else if (embeddedAmount != null) {
                     priceTextView.setText(String.format(" * %s = %s",
-                            priceFormatter.format(productPrice),
+                            priceFormatter.format(productPrice, true),
                             priceFormatter.format(productPrice * embeddedAmount)));
                 } else if (embeddedWeight != null) {
                     String priceSum = priceFormatter.format(product.getPriceForQuantity(embeddedWeight, scannedCode, roundingMode));