jcronenberg / agama / 12886528863

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fix(web): fix TPM check when using the legacy AutoYaST mode (#1927)

## Problem

When using the legacy AutoYaST mode, the web UI crashes at the end of
the installation when trying
to find our whether it is using TPM or not.

- https://github.com/agama-project/agama/issues/1918

## Solution

Properly handle that case:

* `fetchConfig` now returns `null` instead of `undefined`. According to
[TanStack Query

documentation](https://tanstack.com/query/latest/docs/framework/react/reference/useQuery),
`queryFn`
*Must return a promise that will either resolve data or throw an error.
The data cannot be
undefined*.
* `usingTpm` function now handles the case where the configuration is
`null`.

## Testing

- *Tested manually*

1766 of 2613 branches covered (67.59%)

Branch coverage included in aggregate %.

23889 of 32993 relevant lines covered (72.41%)

41.66 hits per line