API issue: warehouse:getInventory excludes 0-qty items

[Laxxor]

getInventory  gives a complete inventory for a warehouse, but seems to exclude items that are fully depleted, instead of returning "0" as the qty.

If i use

warehouse.getItemCount(wh, <depletedItem>)

it will return 0, showing the warehouse has the item, but its qty is 0.

why does getInventory exclude 0-qty items?