kbld with flag --json swallows error

[kumaritanushree]

What steps did you take: I have config.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: kbld-nginx
spec:
  selector:
    matchLabels:
      app: kbld-nginx
  template:
    metadata:
      labels:
        app: kbld-nginx
    spec:
      containers:
      - name: my-app
        image: nginxix

And it is throwing error when run kbld command without --json flag:

$ kbld -f nginx/config.yml 
kbld: Error: 
- Resolving image 'nginxix': GET https://index.docker.io/v2/library/nginxix/manifests/latest: UNAUTHORIZED: authentication required; [map[Action:pull Class: Name:library/nginxix Type:repository]]

While it will exit without printing any error message or any log if will run with flag --json

What happened: When we run kbld command with flag --json it is exiting without printing any error message or any log in case of failure.

What did you expect: When we run kbld command with flag --json it should print error message in case of failure.

Anything else you would like to add: [Additional information that will assist in solving the issue.]

Environment:

• kbld version (use kbld --version):
• Docker registry used (e.g. Docker HUB):
• OS (e.g. from /etc/os-release):

If building images using docker:

• Docker CLI Version (e.g. docker version)

If building images using buildkit:

• Buildkit version (e.g. kubectl buildkit version):
• Kubernetes version (e.g. kubectl version):

If building images using pack

• Pack Version (e.g. pack version):

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