[release-4.16] OCPBUGS-42068: ztp: ignore empty file in siteconfig extra manifests

[openshift-cherrypick-robot]

This is an automated cherry-pick of #2027

/assign sabbir-47

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci-robot]

@openshift-cherrypick-robot: Jira Issue OCPBUGS-41505 has been cloned as Jira Issue OCPBUGS-42068. Will retitle bug to link to clone.
/retitle [release-4.16] OCPBUGS-42068: ztp: ignore empty file in siteconfig extra manifests

In response to this:

This is an automated cherry-pick of #2027

/assign sabbir-47

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the openshift-eng/jira-lifecycle-plugin repository.

[openshift-ci-robot]

@openshift-cherrypick-robot: This pull request references Jira Issue OCPBUGS-42068, which is invalid:

• expected dependent Jira Issue OCPBUGS-41505 to be in one of the following states: VERIFIED, RELEASE PENDING, CLOSED (ERRATA), CLOSED (CURRENT RELEASE), CLOSED (DONE), CLOSED (DONE-ERRATA), but it is MODIFIED instead

Comment /jira refresh to re-evaluate validity if changes to the Jira bug are made, or edit the title of this pull request to link to a different bug.

The bug has been updated to refer to the pull request using the external bug tracker.

In response to this:

This is an automated cherry-pick of #2027

/assign sabbir-47

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the openshift-eng/jira-lifecycle-plugin repository.