playbook fails on IP entries without hostname

[rderooy]

In Netbox I had created some "Reserved" IP addresses, without hostname. But when running the ansible playbook, it fails with

FAILED! => {"changed": false, "msg": "AnsibleUndefinedVariable: 'dict object' has no attribute 'interface'"}

When grabbing data from Netbox, it should probably only get the "Active" IP addresses. And IP addresses without hostname should probably just be ignored.