redirectUriAsPostLogoutRedirectUriFallback has no effect when there is no id_token

[buchatsky]

Describe the bug
When postLogoutRedirectUri is not set and AuthConfig.redirectUriAsPostLogoutRedirectUriFallback = true and Identity Server does not return id_token, logOut() does not go to AuthConfig.logoutUrl.

Expected behavior
logOut() to go to AuthConfig.logoutUrl.

Library version
13.0.1

Additional context
Library source code:

logOut(customParameters = {}, state = '') {
...
if (!id_token && !this.postLogoutRedirectUri) {
  return; // exits HERE
}
...
const postLogoutUrl = this.postLogoutRedirectUri ||
  (this.redirectUriAsPostLogoutRedirectUriFallback && this.redirectUri) ||   // is NOT reached
  '';
...
}

[jeroenheijmans]

Possibly the same as #1188?

[buchatsky]

No, it is not connected to refresh token. I use custom Identity Server, not IdS4

[manfredsteyer]

Good catch. I think the reason was this endpoint is defined by OIDC. But the code should also work w/o id_token. Hence, the next version will not have this if.