BUG: kubelogin convert-kubeconfig manifests invalid kubeconfig (env: null)

[raminqaf]

Whenever I use kubelogin convert-kubeconfig -l azurecli the populated kubeconfig file contains an invalid field env: null. According to the kubeconfig documentation, this field is not optional, meaning that it should not be null but rather an empty object. The correct form would be env: {}. This causes an exception in our project when using the Kubernetes Python client (lightkube).

The issue is also raised in the lightkube repository: gtsystem/lightkube#39

To reproduce this bug, simply run:

kubelogin convert-kubeconfig -l azurecli

afterward check your kubeconfig file:

vim ./.kube/config

If you search for env:, you will find the value null.