Fix TypeError in processing profile selections

[qduanmu]

Description:

Fix the TypeError: 'NoneType' object is not iterable when processing profile selections

Review Hints:

Some profiles has no 'selections' but just a 'extends'. e.g., ocp4/profiles/pci-dss-node.profile

[openshift-ci]

Hi @qduanmu. Thanks for your PR.

I'm waiting for a ComplianceAsCode member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[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 ed3742e 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 61.6% (0.0% change).

View more on Code Climate.

[marcusburghardt]

@qduanmu , thank you very much for catching this issue and promptly providing a fix. In the meantime I was working on #12797 and incorporated your fix here 43a9395 . Is that ok for you?