Cannot set config option to empty string in inspector

[makyo]

Setting a config value to an empty string (away from the default) does not make the change in the model. This occurs both for uncommitted and committed services.

For instance, deploy ~yellow/jujushell and change juju-cert to an empty string during deploy. It will revert to from-unit on refresh. Change it again once deployed, the same will happen. run juju config jujushell juju-cert='' from the CLI and refresh the GUI; the config setting will be an empty string.

[huwshimi]

The RPC call made is {"type":"Application","request":"Deploy","params":{"applications":[{"application":"jujushell-a","charm-url":"cs:~yellow/jujushell-2","constraints":{},"num-units":0,"resources":{"jujushell":"0b034d4f-5987-454a-8f6d-02b170f09664","termserver":"34ff3d50-aaf2-4b5d-81ba-99bbc9cb798e"},"config":{"juju-addrs":"","juju-cert":"","log-level":"info","port":"8047","snap_proxy":""},"series":"xenial"}]},"version":4,"request-id":16}

This has juju-cert set to a blank string. Is it possible Juju is not reading/setting these values correctly?

[hatched]

Thanks @huwshimi

Yes this does appear to be a Juju bug https://bugs.launchpad.net/juju/+bug/1513466

Also related: #2486