username/password authentication - errors not presented to user

[macfarla]

eg if you get your password wrong, you get an empty response rather than "Invalid password".

Stepping through it with a debugger I can see the "Invalid password" error but it gets lost somewhere

➜  ~ curl -X POST --data '{"username":"username1","password":"NotMyPassword"}' http://localhost:8545/login


➜  ~ curl -X POST --data '{"username":"username1","password":"MyPassword"}' http://localhost:8545/login


{"token":"redacted"}%
➜  ~

latest besu
following instructions here to setup username/password auth https://besu.hyperledger.org/stable/public-networks/how-to/use-besu-api/authenticate#json-rpc-permissions