[release-4.18] CNV-56688: Avoid CPU helper text error if CPU threads is undefined

[openshift-cherrypick-robot]

This is an automated cherry-pick of #2614

/assign batyana

[openshift-ci-robot]

@openshift-cherrypick-robot: Ignoring requests to cherry-pick non-bug issues: CNV-56688

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In response to this:

This is an automated cherry-pick of #2614

/assign batyana

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