have the environment variable as optional

[dagap]

I am using a third-party SW which has a trial version when the license key is not specified. In my config file, I have the following:

licence: ${env:SERVER_LICENSE}

Now if this license env variable does not exist, my code fails with:

Environment variable 'SERVER_LICENSE' not found

Is there a way to allow this to be None or not existing from the config file? I know I can probably set it in the config in case it is missing manually but that is very hacky and I have various alternate tools integrated which does not have this license files requirement and I will have top make this fix for this one tool.

[Jasha10]

Please give the following a try:

licence: ${oc.env:SERVER_LICENSE,null}

Note that env is deprecated in favor of oc.env. See the docs on the oc.env resolver.