basic authentication with json registry config doesn't work

[koiuo]

In our company we use artifactory with anonymous downloads allowed. To be able to fetch a base image I use following makisu.yaml and it works just fine

artifactory.mycompany.com:
  docker-registry:
    security:
      tls:
        client:
          disabled: true
      basic:
        username: ""
        password: ""

But being converted to json it just won't work

{ "artifactory.mycompany.com": { "docker-registry": { "security": { "tls": { "client": { "disabled": true } }, "basic": { "username": "", "password": "" } } } } }

I tried using {}s for empty values, tried removing basic block, etc.. It never works.

Seems, that json mapping is broken.

Let me know, if any other details are needed to reproduce this.

May be related to #157