Comment 8 for bug 1546201

I think res.properties.get(subnet.Subnet.NETWORK) can return either a name or an ID, can't it?

But you're right, if it's an ID and it's created in the template then it will be None. Meaning we'll probably end up with a dependency on all Subnets (which is not terrible in most cases).

The better placeholder stuff for validation we talked about at the summit should help improve this in future. This whole area is a mess at the moment - see https://review.openstack.org/#/c/289371/