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Automatic merge from submit-queue Fixing unbound bash variable. **What this PR does / why we need it**: this fixes a bug introduced in 1.6 for ABAC. **Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes # **Special notes for your reviewer**: without this, we hit an unbound variable and fail to bring up the kube-apiserver with ABAC enabled. **Release note**: ```release-note ```