Fix crash looping when leader election config doesn't exist (#1142)

[pmorie]

Cherry-pick of #1142

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[mattmoor]

/lgtm

[evankanderson]

@googlebot wtf

/lgtm
/approve

I'm guessing that this is how we want to pull this pkg change forward into the 0.13 release branches in other repos.

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: evankanderson, pmorie

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[vagababov]

/check-cla

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[isdal]

cla label updated. Odd.

[vagababov]

/label cla: yes
remove-label cla: no