[BUG] Typescript-node does not apply basic auth with blank username or password

Description

Using Basic auth should be possible with empty username, however, 4.3.3 generates this code:

  let authenticationPromise = Promise.resolve();
        if (this.authentications.BasicAuth.username && this.authentications.BasicAuth.password) {
            authenticationPromise = authenticationPromise.then(() => this.authentications.BasicAuth.applyToRequest(localVarRequestOptions));
        }

since "" is falsy, auth is never applied if either username or password is empty.

openapi-generator version

Worked in 4.2.2, fails in 4.2.3. Introduced by #4896

OpenAPI declaration file content or url

N/A

Command line used for generation

openapi-generator generate -i api.yaml -g typescript-node --additional-properties=supportsES6=true

Related issues/PRs

introduced by #4896

Reproduce the issue with the supplied OpenAPI Generator command and compare typescript-node output between versions 4.2.2 and 4.2.3. Inspect the change introduced by #4896 and locate the generated BasicAuth handling; done means authentication is applied when either the username or password is blank, with a regression test covering that case.