* Add token null check

* Revert "Add token null check"

This reverts commit 662f04935e758e0557d7d162e1fad2a559944235.

* Update AuthenticationService.ts

Co-authored-by: Tanay Parikh <TanayParikh@users.noreply.github.com>
Co-authored-by: Tanay Parikh <taparik@microsoft.com>