agama-project / agama / 13525056811

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Fix agama config show before a product is selected (#2066)

## Problem

- https://github.com/agama-project/agama/issues/2057 
- https://trello.com/c/I7rdVd7D

## Solution

~Return an empty JSON object (Ruby Hash) instead of null/nil~

Adapt the Rust client to deal with the `null` and omit the section.

## Testing

- Tested manually: 
  - `./testing-using-container.sh` and in its shell, `agama config show`
  - Web UI still works normally
- Added a unit test

## Debugging

[`git bisect`](https://git-scm.com/docs/git-bisect) saved me

## Screenshots

No

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19890 of 27375 relevant lines covered (72.66%)

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