Two commits that are added in class SimpleAuthenticationProvider break our application.

Commit #1: c318306
Commit #2: cb9c92d

Problem is when I have a token class that have anonymous user. So in getUser() i get an empty string. ('')

Also in last version it wasn't necessary to pass $user object, now it is.

It is needed to find way how to handle public token when we have anonymous user.

Corresponding PR #26370

Thanks for your time :D