Build empty OVAL

[jan-cerny]

If we build a thin data stream for a rule that doesn't contain any OVAL check, the build fails because no OVAL file is generated. In this situation, we will generate a minimal OVAL file that doesn't contain any checks. Unfortunately, not building the OVAL file at all would be difficult to be handle by CMake, therefore, we will have a minimal valid OVAL file as a work around. The artifact doesn't matter because thin data streams aren't shipped.

Fixes: #12228

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[github-actions]

Start a new ephemeral environment with changes proposed in this pull request:

Fedora Environment

Oracle Linux 8 Environment

[github-actions]

🤖 A k8s content image for this PR is available at:
ghcr.io/complianceascode/k8scontent:12262
This image was built from commit: 987d168

Click here to see how to deploy it

If you alread have Compliance Operator deployed:
utils/build_ds_container.py -i ghcr.io/complianceascode/k8scontent:12262

Otherwise deploy the content and operator together by checking out ComplianceAsCode/compliance-operator and:
CONTENT_IMAGE=ghcr.io/complianceascode/k8scontent:12262 make deploy-local

[codeclimate]

Code Climate has analyzed commit 987d168 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 59.4% (0.0% change).

View more on Code Climate.