Merge branch '234-fix-error-500-from-api-fridges-waste-product-116' into 'main'

Resolve "Fix error 500 from  /api/fridges/waste/product/116"

Closes #234

See merge request idatt2106-v23-03/backend!173

src/main/java/ntnu/idatt2016/v233/SmartMat/controller/product/ProductController.java

@@ -65,6 +65,9 @@ public class ProductController {
         if(volumeUnit.isPresent()){
             product.setUnit(volumeUnit.get().get(1));
             product.setAmount(Double.parseDouble(volumeUnit.get().get(0)));
+        }else {
+            product.setUnit("STK");
+            product.setAmount(1.0);
         }
 
         if(productRequest.allergies() != null){