[SPACES] Fix shares space parsing

[abelgardep]

Shares space does have some nullable fields like owner Mountpoints do not have lastModifiedDateTime and eTag is on the remoteItem node. remoteItem not parsed yet, will be done in the future

App PR: https://github.com/owncloud/android/pull/3856

{
  "value": [
    {
      "driveAlias": "virtual/shares",
      "driveType": "virtual",
      "id": "a0ca6a90-a365-4782-871e-d4444$a0ca6a90-a365-4782-871e-d4444",
      "lastModifiedDateTime": "2023-01-11T17:03:47.139082173Z",
      "name": "Shares",
      "quota": {
        "remaining": 0,
        "state": "exceeded",
        "total": 0,
        "used": 0
      },
      "root": {
        "eTag": "\"695b26758d54a156771775099037adfb\"",
        "id": "a0ca6a90-a365-4782-871e-d4444$a0ca6a90-a365-4782-871e-d4444",
        "webDavUrl": "server/dav/spaces/a0ca6a90-a365-4782-871e-d4444$a0ca6a90-a365-4782-871e-d4444"
      },
      "webUrl": "https://server/f/a0ca6a90-a365-4782-871e-d4444$a0ca6a90-a365-4782-871e-d4444"
    },
    {
      "driveAlias": "mountpoint/new-file.txt",
      "driveType": "mountpoint",
      "id": "a0ca6a90-a365-4782-871e-d4444$a0ca6a90-a365-4782-871e-d4444!8871f4f3-fc6f-4a66-8bed-62f175f76f38:c4fc37d9-5798-4a65-a596-00300e180049:9801e90a-a679-4b69-a56f-547527bb9b7b",
      "name": "New file.txt",
      "owner": {
        "user": {
          "id": "c4fc37d9-5798-4a65-a596-00300e180049"
        }
      },
      "quota": {
        "remaining": 0,
        "state": "exceeded",
        "total": 0,
        "used": 0
      },
      "root": {
        "id": "a0ca6a90-a365-4782-871e-d4444$a0ca6a90-a365-4782-871e-d4444!8871f4f3-fc6f-4a66-8bed-62f175f76f38:c4fc37d9-5798-4a65-a596-00300e180049:9801e90a-a679-4b69-a56f-547527bb9b7b",
        "remoteItem": {
          "eTag": "\"695b26758d54a156771775099037adfb\"",
          "file": {
            "mimeType": "text/plain"
          },
          "id": "8871f4f3-fc6f-4a66-8bed-62f175f76f38$c4fc37d9-5798-4a65-a596-00300e180049!4f3edb80-feb8-409b-a01d-e7daccaff13d",
          "lastModifiedDateTime": "2023-01-11T17:03:47.139082173Z",
          "name": "New file.txt",
          "size": 1,
          "webDavUrl": "https://server/dav/spaces/8871f4f3-fc6f-4a66-8bed-62f175f76f38$c4fc37d9-5798-4a65-a596-00300e180049%214f3edb80-feb8-409b-a01d-e7daccaff13d"
        },
        "webDavUrl": "https://server/dav/spaces/a0ca6a90-a365-4782-871e-d4444$a0ca6a90-a365-4782-871e-d4444%218871f4f3-fc6f-4a66-8bed-62f175f76f38:c4fc37d9-5798-4a65-a596-00300e180049:9801e90a-a679-4b69-a56f-547527bb9b7b"
      },
      "webUrl": "https://server/f/a0ca6a90-a365-4782-871e-d4444$a0ca6a90-a365-4782-871e-d4444%218871f4f3-fc6f-4a66-8bed-62f175f76f38:c4fc37d9-5798-4a65-a596-00300e180049:9801e90a-a679-4b69-a56f-547527bb9b7b"
    }
  ]
}