fix bug in EconomicAgent.orders()
fix bug in EconomicAgent.orders()

valnet/valuenetwork,valnet/valuenetwork,django-rea/nrp,FreedomCoop/valuenetwork,valnet/valuenetwork,FreedomCoop/valuenetwork,thierrymarianne/valuenetwork,thierrymarianne/valuenetwork,valnet/valuenetwork,FreedomCoop/valuenetwork,django-rea/nrp,django-rea/nrp,thierrymarianne/valuenetwork,thierrymarianne/valuenetwork,FreedomCoop/valuenetwork,django-rea/nrp