NameValues.CopyOn: don't instanciate a receiving map if there is nothing to copy over
NameValues.CopyOn: don't instanciate a receiving map if there is nothing to copy over

pecigonzalo/packer,pecigonzalo/packer,rnaveiras/packer,rnaveiras/packer,mitchellh/packer,grubernaut/packer,grubernaut/packer,grubernaut/packer,grubernaut/packer,ricardclau/packer,mitchellh/packer,mitchellh/packer,rnaveiras/packer,rnaveiras/packer,mitchellh/packer,hashicorp/packer,rnaveiras/packer,hashicorp/packer,pecigonzalo/packer,rnaveiras/packer,pecigonzalo/packer,ricardclau/packer,ricardclau/packer,ricardclau/packer,hashicorp/packer,mitchellh/packer,grubernaut/packer,hashicorp/packer,grubernaut/packer,ricardclau/packer,ricardclau/packer