Comment 2 for bug 1649527

Looking forwards, I'm pretty sure the right thing is to set conf.script = None instead of = '', so I've posted a change for that at https://review.openstack.org/#/c/411936/.

@sgordon - For the existing VMs that you mention, is there anything that can be done other than fixing libvirt to be back-compatible, in the sense of ignoring a script path of '' ?