Fix 5.10 OVAL validation of core_pattern_empty_string rule

[ggbecker]

Description:

• Fix 5.10 OVAL validation of core_pattern_empty_string rule.

Rationale:

• Fix: https://github.com/ComplianceAsCode/content/runs/8063313709?check_suite_focus=true

[github-actions]

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

Fedora Environment

Oracle Linux 8 Environment

[codeclimate]

Code Climate has analyzed commit d3b7eab 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 42.5% (0.0% change).

View more on Code Climate.

[jan-cerny]

It makes ssg-rhel9-oval.xml in the 5.10 version valid again for me!

[openshift-ci]

@ggbecker: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-aws-rhcos4-e8	d3b7eab	link	true	/test e2e-aws-rhcos4-e8
ci/prow/e2e-aws-rhcos4-moderate	d3b7eab	link	true	/test e2e-aws-rhcos4-moderate
ci/prow/e2e-aws-rhcos4-high	d3b7eab	link	true	/test e2e-aws-rhcos4-high

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