USHIFT-5217: when ovn.yaml file empty the default is overridden with nil

[eslutsky]

No description provided.

[openshift-ci-robot]

@eslutsky: This pull request references USHIFT-5217 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the bug to target the "4.19.0" version, but no target version was set.

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[pmtk]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: eslutsky, pmtk

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[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD e8716b7 and 2 for PR HEAD fb19f96 in total

[openshift-ci]

@eslutsky: all tests passed!

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