Admin contact cannot be removed from private regsitrations

[vohmar]

According to .ee domain regulations admin contact is mandatory for a domain only in case of business registrations.

If privately owned domain has admin contact attached it is currently not possible to remove it
Same goes for tech contacts of any domain registration.

Portal returns message: Command completed successfully
but the admin contact removal request does not even reach registry and nothing is changed -

the request (missing admin contact removal):

{
  "domain": {
    "name": "dispuut.ee",
    "registrant": {
      "code": "EEDIRECT:TESTPRIV2"
    },
    "nameservers": [
      {
        "id": "239979",
        "hostname": "ns1.ee",
        "ipv4": [],
        "ipv6": [],
        "action": "add"
      }
    ]
  },
  "controller": "repp/v1/domains",
  "action": "update",
  "id": "dispuut.ee"
}

In case of tech contact there is a workaround - if registrant adds second tech contact to the registration and then removes both together in one request - then this works. But same does not work for admin contacts. In case of multiple admin contacts, if all are requested to be removed none are, but as long as at least one remains the others can be removed.

Expected: in case of private registrations both admin and tech contacts are optional and can be removed. At least one admin contact is mandatory in case of business owned domain registrations.