What steps did you take:
Run $ imgpkg push -b index.docker.io/username/my-bundle:v1.0.0 -f config/ with wrong username and got error:

dir: .
dir: .imgpkg
file: .imgpkg/images.yml
file: config.yml

imgpkg: Error: Writing 'index.docker.io/username/my-bundle:v1.0.0':
  Writing image:
    HEAD https://index.docker.io/v2/username/my-bundle/blobs/sha256:b622a27ef5b9d02070c45ddbf7a94670f6b41aea673ad91ce7c7315108e9585f: unexpected status code 401 Unauthorized (HEAD responses have no body, use GET for details)

Executed same command with flag --json and this time it exited without printing any error message or any other log.

What happened:
When we run imgpkg command with flag --json it did not print error message in case of failure.

What did you expect:
When we run imgpkg 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:

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

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