a bit related to #4704
1) fixed util.cost.get_total_quantity
2) fixed similar issue in cost.data that calculates the final value that user will see in UI
3) changed UI, "-" is shown when there are no quantities and "0" is when quantities are there but they just equal to zero.
Before - https://i.imgur.com/EO53DhM.png
After - https://i.imgur.com/H6rK4sP.png
fyi @myoualid