And from Juju:

768a4f56ac/": Requested array, got <nil>.
2013-10-08 08:09:04 WARNING juju.worker.addressupdater updater.go:211 cannot get addresses for instance "/MAAS/api/1.0/nodes/node-166f35b8-4527-11e2-ba10-2c768a4f56ac/": Requested array, got <nil>.
2013-10-08 08:09:04 WARNING juju.worker.addressupdater updater.go:211 cannot get addresses for instance "/MAAS/api/1.0/nodes/node-3a42c102-a068-11e2-9b0e-2c768a4f56ac/": Requested array, got <nil>.
2013-10-08 08:09:04 WARNING juju.worker.addressupdater updater.go:211 cannot get addresses for instance "/MAAS/api/1.0/nodes/node-742baf7e-4527-11e2-9188-2c768a4f56ac/": Requested array, got <nil>.
2013-10-08 08:09:04 WARNING juju.worker.addressupdater updater.go:211 cannot get addresses for instance "/MAAS/api/1.0/nodes/node-0d121d8c-4527-11e2-ba10-2c768a4f56ac/": Requested array, got <nil>.
2013-10-08 08:09:05 WARNING juju.worker.addressupdater updater.go:211 cannot get addresses for instance "/MAAS/api/1.0/nodes/node-53a802a2-4527-11e2-9188-2c768a4f56ac/": Requested array, got <nil>.
2013-10-08 08:09:05 WARNING juju.worker.addressupdater updater.go:211 cannot get addresses for instance "/MAAS/api/1.0/nodes/node-3aa538e2-4527-11e2-9188-2c768a4f56ac/": Requested array, got <nil>.
2013-10-08 08:09:05 WARNING juju.worker.addressupdater updater.go:211 cannot get addresses for instance "/MAAS/api/1.0/nodes/node-166f35b8-4527-11e2-ba10-2c768a4f56ac/": Requested array, got <nil>.
2013-10-08 08:09:05 WARNING juju.worker.addressupdater updater.go:211 cannot get addresses for instance "/MAAS/api/1.0/nodes/node-3a42c102-a068-11e2-9b0e-2c768a4f56ac/": Requested array, got <nil>.
2013-10-08 08:09:05 WARNING juju.worker.addressupdater updater.go:211 cannot get addresses for instance "/MAAS/api/1.0/nodes/node-742baf7e-4527-11e2-9188-2c768a4f56ac/": Requested array, got <nil>.
2013-10-08 08:09:06 WARNING juju.worker.addressupdater updater.go:211 cannot get addresses for instance "/MAAS/api/1.0/nodes/node-0d121d8c-4527-11e2-ba10-2c768a4f56ac/": Requested array, got <nil>.
2013-10-08 08:09:06 WARNING juju.worker.addressupdater updater.go:211 cannot get addresses for instance "/MAAS/api/1.0/nodes/node-53a802a2-4527-11e2-9188-2c768a4f56ac/": Requested array, got <nil>.
2013-10-08 08:09:06 WARNING juju.worker.addressupdater updater.go:211 cannot get addresses for instance "/MAAS/api/1.0/nodes/node-3aa538e2-4527-11e2-9188-2c768a4f56ac/": Requested array, got <nil>.
2013-10-08 08:09:06 WARNING juju.worker.addressupdater updater.go:211 cannot get addresses for instance "/MAAS/api/1.0/nodes/node-166f35b8-4527-11e2-ba10-2c768a4f56ac/": Requested array, got <nil>.
2013-10-08 08:09:07 WARNING juju.worker.addressupdater updater.go:211 cannot get addresses for instance "/MAAS/api/1.0/nodes/node-3a42c102-a068-11e2-9b0e-2c768a4f56ac/": Requested array, got <nil>.
2013-10-08 08:09:07 WARNING juju.worker.addressupdater updater.go:211 cannot get addresses for instance "/MAAS/api/1.0/nodes/node-742baf7e-4527-11e2-9188-2c768a4f56ac/": Requested array, got <nil>.
2013-10-08 08:09:07 WARNING juju.worker.addressupdater updater.go:211 cannot get addresses for instance "/MAAS/api/1.0/nodes/node-0d121d8c-4527-11e2-ba10-2c768a4f56ac/": Requested array, got <nil>.
2013-10-08 08:09:07 WARNING juju.worker.addressupdater updater.go:211 cannot get addresses for instance "/MAAS/api/1.0/nodes/node-53a802a2-4527-11e2-9188-2c768a4f56ac/": Requested array, got <nil>.
2013-10-08 08:09:08 WARNING juju.worker.addressupdater updater.go:211 cannot get addresses for instance "/MAAS/api/1.0/nodes/node-3aa538e2-4527-11e2-9188-2c768a4f56ac/": Requested array, got <nil>.
2013-10-08 08:09:08 WARNING juju.worker.addressupdater updater.go:211 cannot get addresses for instance "/MAAS/api/1.0/nodes/node-166f35b8-4527-11e2-ba10-2c768a4f56ac/": Requested array, got <nil>.
2013-10-08 08:09:08 WARNING juju.worker.addressupdater updater.go:211 cannot get addresses for instance "/MAAS/api/1.0/nodes/node-3a42c102-a068-11e2-9b0e-2c768a4f56ac/": Requested array, got <nil>.
2013-10-08 08:09:08 WARNING juju.worker.addressupdater updater.go:211 cannot get addresses for instance "/MAAS/api/1.0/nodes/node-742baf7e-4527-11e2-9188-2c768a4f56ac/": Requested array, got <nil>.
2013-10-08 08:09:08 WARNING juju.worker.addressupdater updater.go:211 cannot get addresses for instance "/MAAS/api/1.0/nodes/node-0d121d8c-4527-11e2-ba10-2c768a4f56ac/": Requested array, got <nil>.
2013-10-08 08:09:09 WARNING juju.worker.addressupdater updater.go:211 cannot get addresses for instance "/MAAS/api/1.0/nodes/node-53a802a2-4527-11e2-9188-2c768a4f56ac/": Requested array, got <nil>.
2013-10-08 08:09:09 WARNING juju.worker.addressupdater updater.go:211 cannot get addresses for instance "/MAAS/api/1.0/nodes/node-3aa538e2-4527-11e2-9188-2c768a4f56ac/": Requested array, got <nil>.
2013-10-08 08:09:09 WARNING juju.worker.addressupdater updater.go:211 cannot get addresses for instance "/MAAS/api/1.0/nodes/node-166f35b8-4527-11e2-ba10-2c768a4f56ac/": Requested array, got <nil>.
2013-10-08 08:09:09 WARNING juju.worker.addressupdater updater.go:211 cannot get addresses for instance "/MAAS/api/1.0/nodes/node-3a42c102-a068-11e2-9b0e-2c768a4f56ac/": Requested array, got <nil>.
2013-10-08 08:09:09 WARNING juju.worker.addressupdater updater.go:211 cannot get addresses for instance "/MAAS/api/1.0/nodes/node-742baf7e-4527-11e2-9188-2c768a4f56ac/": Requested array, got <nil>.