skip /api/request-token request when auth is disabled

when run local bridge with auth disabled, we can see error
GET http://localhost:9000/api/request-token 404 (Not Found) 

latest master

Always

1. fetch latest openshift/console code and build
2. run local bridge './bin/bridge'
3.

visiting localhost:9000 we can see errors GET http://localhost:9000/api/request-token 404 (Not Found) 

maybe we should skip /api/request-token request when auth is disabled, as suggested in https://github.com/openshift/console/pull/12553#discussion_r1103151813