Comment 1 for bug 1252811

Address is set to empty, so 'invalid address' is returned.

{"vip": {"session_persistence": {}, "protocol": "HTTP", "name": "MyVip", "address": "", "subnet_id": "6b69d9cd-f2fc-4cea-b237-a645ec34af5c", "protocol_port": 55, "admin_state_up": true, "pool_id": "99a1713d-58cc-433b-9932-f3a8c4f524ea", "description": "A vip w/o free ip "}}

HTTP/1.1 400 Bad Request
Content-Length: 84
Content-Type: application/json; charset=UTF-8

{"NeutronError": "Invalid input for address. Reason: '' is not a valid IP address."}

The field can be removed or set to null ( None before json conversion ) if not mandatory