fix another bug in resource.context_agents()
fix another bug in resource.context_agents()

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