logger: gracefully handle missing `request.user`
logger: gracefully handle missing `request.user`

Might be the case early during request processing, i.e. auth
middleware has not yet added it.

Kegbot/kegbot-server,Kegbot/kegbot-server,Kegbot/kegbot-server,Kegbot/kegbot-server,Kegbot/kegbot-server