Fix syntax error on the common script

[clebs]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug
/kind cleanup
/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:
Fixes a syntax issue on the deploy/common.sh script when checking for unset variables.

Which issue(s) this PR fixes:

Fixes #493

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

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[k8s-ci-robot]

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[clebs]

/assign @davidz627

[msau42]

/ok-to-test

[msau42]

/retest

[msau42]

None of the variables I see ensure_var used with are expected to be empty. So I think this is fine.

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: clebs, msau42

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[clebs]

Thanks for the quick review and merge @msau42!