[BUG] typescript-rxjs typescript nullsafe issues in runtime.ts

Created by: balazs-zsoldos

Description

In the generated runtime.ts file there are two nullsafe check errors.

openapi-generator version

4.0.2

OpenAPI declaration file content or url

Independent from json as it is in runtime.ts.

Command line used for generation

Maven plugin was used, but that does not matter. Using typescript-rxjs generates the runtime.ts file that has the errors.

Steps to reproduce

Generate a client code with typescript-rxjs from any kind of json.

Related issues/PRs

N/A

Suggest a fix

Suggested PR will come in a minute.