What happened:
kubectl config set hangs on certain input.

What you expected to happen:
That the command returns either successfully or with an error (and a message).

How to reproduce it (as minimally and precisely as possible):
kubectl config set users.my-user.user.exec.command test

Anything else we need to know?:

Environment:

• Kubernetes version (use kubectl version): tried 1.15.3 and 1.12.10
• Cloud provider or hardware configuration:
• OS (e.g: cat /etc/os-release): OS X
• Kernel (e.g. uname -a):
• Install tools:
• Network plugin and version (if this is a network-related bug):
• Others: