Return an empty list on FIP listing failure
Return an empty list on FIP listing failure

We don't want a 404 - we want an empty list.

Change-Id: Ia30077d4093b224485b9953c5ad9d2d7c811ec50

openstack-infra/shade,openstack/python-openstacksdk,stackforge/python-openstacksdk,openstack-infra/shade,dtroyer/python-openstacksdk,stackforge/python-openstacksdk,openstack/python-openstacksdk,dtroyer/python-openstacksdk