slapos_panel: Person_addVirtualMaster: try to find trade condition with Trade Model Line and currency

Those info are not supposed to be set on order/delivery (ie, there is no field for this)

It is too complex (as it requires to create Trade Condition, Assignment, Project, etc...), and I don't know for now how to make something generic from it.
Use a custom action for now.

To drop warning in logs

for accounting less subscription

Needed for accounting less Open Order.

This work must be done later