Initialize prefix remapping map to avoid panic

[pierDipi]

A nil target passed to AsOptionalMap causes a panic.

Signed-off-by: Pierangelo Di Pilato pierdipi@redhat.com

[pierDipi]

--- FAIL: TestAdmissionInvalidResponseForResource (0.21s)
    logger.go:130: 2022-03-09T07:23:52.630Z	INFO	webhook/webhook.go:198	Informers have been synced, unblocking admission webhooks.
    logger.go:130: 2022-03-09T07:23:52.736Z	ERROR	webhook/webhook.go:148	failed to fetch secret	{"error": "secret \"webhook-certs\" not found"}
    admission_integration_test.go:403: Failed to receive response Get "https://0.0.0.0:39661/booger": remote error: tls: unrecognized name
    logger.go:130: 2022-03-09T07:23:52.736Z	INFO	webhook/webhook.go:240	Starting to fail readiness probes...
2022/03/09 07:23:52 http: TLS handshake error from 127.0.0.1:39998: EOF
2022/03/09 07:23:53 http: TLS handshake error from 127.0.0.1:37770: EOF
2022/03/09 07:23:53 http: TLS handshake error from 127.0.0.1:60496: EOF
2022/03/09 07:23:53 http: TLS handshake error from 127.0.0.1:43356: EOF
FAIL

#2432

[codecov]

Codecov Report

Merging #2453 (843d8fb) into main (d2cdc68) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2453      +/-   ##
==========================================
+ Coverage   63.55%   63.60%   +0.04%     
==========================================
  Files         228      228              
  Lines        9999    10000       +1     
==========================================
+ Hits         6355     6360       +5     
+ Misses       3342     3340       -2     
+ Partials      302      300       -2     

Impacted Files	Coverage Δ
leaderelection/config.go	80.00% <100.00%> (+0.40%)	⬆️
test/gcs/mock/mock.go	93.54% <0.00%> (+2.15%)	⬆️

---

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[dprotaso]

/lgtm
/approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso, pierDipi

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[pierDipi]

/cherry-pick release-1.3

[knative-prow-robot]

@pierDipi: new pull request created: #2459

In response to this:

/cherry-pick release-1.3

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