Use case to reproduce the bug:
- Create a PO line with 10 product -> validate the picking
- Edit the PO line and add 10 product -> it creates a new picking with a move line
- Edit the PO line and remove the 10 products
-> There still an empty picking that is not linked to the PO.
This happens because the _create_or_update_picking in purchase
only remove the stock move if it is empty but do not check anything
on the picking.
This commit add a check on the picking if there is no move inside,
delete it.
amoyaux
010b4a1000