Nodes list command returns empty namespace in authkey

[0xcd0e]

Tested on v0.10.2
When listing information about nodes which have been joined using a preauthkey, the namespace object inside the preauthkey object is not populated correctly

# headscale nodes -n testns list -o json
[
        {
                "ID": 1,
                "MachineKey": "332311d54e1b8b5429494123623dd7a01156d2245d08edac2188c9ca55645b76",
                "NodeKey": "2400f510fea77c800dcfe6b89507e77ed5444d8614be6902d1319ef9dd05fd58",
                "DiscoKey": "6a946ec9ebd99263fb8bb85947f74163710ae4c8622599612747833d91238742",
                "IPAddress": "100.64.0.1",
                "Name": "ts-client",
                "NamespaceID": 1,
                "Namespace": {
                        "ID": 1,
                        "CreatedAt": "2021-10-14T20:24:28.112659768+02:00",
                        "UpdatedAt": "2021-10-14T20:24:28.112659768+02:00",
                        "DeletedAt": null,
                        "Name": "testns"
                },
                "Registered": true,
                "RegisterMethod": "authKey",
                "AuthKeyID": 1,
                "AuthKey": {
                        "ID": 1,
                        "Key": "d87cea8feef8efb95004b8a8f8a3336c711b6a8749e393cb",
                        "NamespaceID": 1,
                        "Namespace": {
                                "ID": 0,
                                "CreatedAt": "0001-01-01T00:00:00Z",
                                "UpdatedAt": "0001-01-01T00:00:00Z",
                                "DeletedAt": null,
                                "Name": ""
                        },
                        "Reusable": false,
                        "Ephemeral": false,
                        "Used": true,
                        "CreatedAt": "2021-10-14T18:25:33.609874717Z",
                        "Expiration": null
                },
                "LastSeen": "2021-10-14T18:40:13.312955161Z",
                "LastSuccessfulUpdate": "2021-10-14T18:40:03.335144188Z",
                "Expiry": "0001-01-01T00:00:00Z",
                "HostInfo": {
                        "IPNVersion": "1.16.0-t86bcf6a96-gf787a582e",
                        "BackendLogID": "32a8ab2521bda27d7d40cb99d9436a1cc628d5f71fb0f8d8b9572468b95e627c",
                        "OS": "linux",
                        "OSVersion": "Debian 10.11 (buster); kernel=4.19.0-18-amd64",
                        "Hostname": "ts-client",
                        "GoArch": "amd64",
                        "Services": [
                                {
                                        "Proto": "peerapi4",
                                        "Port": 58436
                                }
                        ],
                        "NetInfo": {
                                "MappingVariesByDestIP": false,
                                "HairPinning": false,
                                "WorkingIPv6": true,
                                "WorkingUDP": true,
                                "UPnP": true,
                                "PMP": false,
                                "PCP": true,
                                "PreferredDERP": 1,
                                "DERPLatency": {
                                        "1-v4": 0.101115156,
                                        "1-v6": 0.092313259,
                                        "6-v4": 0.161891963,
                                        "6-v6": 0.15165066,
                                        "9-v4": 0.153036126
                                }
                        }
                },
                "Endpoints": [
                        "x.x.x.x:64291",
                        "[xxx]:41641",
                        "192.168.1.20:41641"
                ],
                "EnabledRoutes": null,
                "CreatedAt": "2021-10-14T20:26:21.785091291+02:00",
                "UpdatedAt": "2021-10-14T20:40:13.313129203+02:00",
                "DeletedAt": null
        }
]

Nodes[0].AuthKey.Namespace

{
        "ID": 0,
        "CreatedAt": "0001-01-01T00:00:00Z",
        "UpdatedAt": "0001-01-01T00:00:00Z",
        "DeletedAt": null,
        "Name": ""
}