Failed to abort an upload when upload user already deleted

[atruskie]

It looks like the sftpgo user was already deleted but that blocks our harvest from being aborted.

If already deleted then no problem, so just keep going!

PATCH https://api.ecosounds.org/harvests/295
{
    "meta": {
        "status": 500,
        "message": "Internal Server Error",
        "error": {
            "details": "Upload service failure: Failed to delete_upload_user, got 404",
            "info": null
        }
    },
    "data": null
}

On fix update: 295, 294, 292 on Ecosounds