Error when evaluating 'strategy' for job 'verify'. apache/maven-gh-actions-shared/.github/workflows/maven-verify.yml@v5 (

### Bug description

The following error is emitted when using `apache/maven-gh-actions-shared/.github/workflows/maven-verify.yml@v5`

```
Error when evaluating 'strategy' for job 'verify'. apache/maven-gh-actions-shared/.github/workflows/maven-verify.yml@v5 (Line: 367, Col: 16): Error from function 'fromJSON': empty input, apache/maven-gh-actions-shared/.github/workflows/maven-verify.yml@v5 (Line: 367, Col: 16): Unexpected value '', apache/maven-gh-actions-shared/.github/workflows/maven-verify.yml@v5 (Line: 369, Col: 18): Error from function 'fromJSON': empty input, apache/maven-gh-actions-shared/.github/workflows/maven-verify.yml@v5 (Line: 369, Col: 18): Unexpected value ''
```

(for example in https://github.com/apache/maven-resolver/actions/runs/29639675830). The job is called with these parameters:

https://github.com/apache/maven-resolver/blob/dbaf30986168a4c66700193fba7b80b651a84445/.github/workflows/maven-verify.yml#L25-L33

Start with .github/workflows/maven-verify.yml around lines 367 and 369, then compare the calling workflow in maven-resolver at lines 25-33. Reproduce the failure using the referenced GitHub Actions run and verify that the verify job no longer receives empty inputs for fromJSON when the reported parameters are used.

Written by the indexing model from the issue text.