Get topic list as JSON returns message instead of empty list

[b1zzu]

Description

Version: rhoas version 0.22.1

Steps to reproduce

1. Create a new Kafka instance and use it
2. Run rhoas kafka topic list -o json

Expected vs actual behaviour

I expected it to return the standard JSON object with empty items: {"items": []}
but I got this message: Kafka instance "test-dbizzarr" has no topics. Run "rhoas kafka topic create <topic-name>" to create one

[b1zzu]

@craicoverflow Should we fix this on the CLI, wdyt?

[craicoverflow]

Yeah, I agree with this. However this could break things for people using the CLI, so let's check the wider impact before doing it.

[b1zzu]

the idea here is when using the -o json option, otherwise, it should report the message if empty

[craicoverflow]

This has been included in the latest alpha release https://github.com/redhat-developer/app-services-cli/releases/tag/0.23.0-alpha3.

Thanks again for logging the issue!

[b1zzu]

@craicoverflow tests have already pick it up :)