Fix fallback logic

[ashwindasr]

Follows #772, where we accidentally included a regression to the fallback logic. We need to fallback when the file does not exist, not the field itself.

[openshift-ci]

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[openshift-ci]

@ashwindasr: The following test 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/security	6ef8de7	link	false	/test security

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[ashwindasr]

rebase succeeded