Bug: openstack:facts sets ansible_host to an empty string if no public IP is present

Summary

openstack:facts sets ansible_host to an empty string if no public IP is present

Steps to reproduce

1. Create an instance.
2. Do not set a floating IP.
3. Do not set openstack_instance_ansible_network in inventory.

Expected behavior

ansible_host == openstack_server.private_v4

Actual behavior

ansible_host == ''

Possible fixes

Change

if 'public_v4' in server:

to

if server.get('public_v4', ''):