Third-party settings consistency.

@_tarik_ i don't think that storing empty third_party_settings around is a good idea. I am not 100% sure, but it might also introduce unnecesary dependencies in the domain not using the country_path functionality to the module. I think a better approach might be to alter de JSON:API response to include the empty values in the response, for example.

I am setting this issue as won't fix.