`process_orchestration` raises ValidationError of pydantic

Hi, when I try to do orchestration of a service, I get a ValidationError of pydantic. When I debug the code step by step, I realize that `authenticationInfo` couldn't get from core service Orchestration. It's actually null in the database and this doesn't cause an error in Java client. However when I debug and I even change the provider value orchestration response as `authenticationInfo = null`, error continue. Finally, I changed the provider value of orchestration response as `authenticationInfo = ""` and it was fixed. Even provider `authenticationInfo` is nonrequired, `process_orchestration` raises error. I'm sharing debugging screenshots.

`authenticationInfo` is returned from core service Orchestration and there is no exception in Java client
`authenticationInfo` couldn't get from service Orchestration
`authenticationInfo` couldn't get from service Orchestration and error raised from pydantic like below
`authenticationInfo` couldn't get from service Orchestration and I added it as null but error raised from pydantic like below,

process_orchestration による orchestration response の処理を追跡し、authenticationInfo とレポートに示されている Pydantic のバリデーションに注目します。null 値のケースを再現し、空文字列のケースと比較します。完了条件は、null のオプショナルな authenticationInfo が ValidationError を発生させなくなることです。

索引モデルが issue の本文から書いたものです。