We recently added a better reporting mechanism for oauth tokens
in the dev-infra git util. Unfortunately the logic broke as part
of addressing PR review feedback. Right now, always the empty
promise from `oauthScopes` will be used as `getAuthScopes` considers
it as the already-requested API value. This is not the case as
the default promise is also truthy. We should just fix this by making
the property nullable.
PR Close#37439
b2bd38699b