fix: resolve panic issue in script when label is specified during bundle build

[l-qing]

reproduction steps

cd operatorhub/

wget https://storage.googleapis.com/tekton-releases/operator/previous/v0.74.0/release.yaml

export BUNDLE_ARGS="--workspace kubernetes --operator-release-version 1.2.3 --channels alpha --default-channel alpha --fetch-strategy-release-manifest --release-manifest $(pwd)/release.yaml --upgrade-strategy-semver --addn-labels key1=val1,key2=val2"

make operator-bundle

-------------------------
Results:
-------------------------

:::::::::::::::::::::::::
::::: update csv
:::::::::::::::::::::::::
Traceback (most recent call last):
  File "/Users/liuqing/code/alauda/katanomi/tekton-operator/operatorhub/./tools/bundle.py", line 328, in <module>
    newCSVmods(config)
  File "/Users/liuqing/code/alauda/katanomi/tekton-operator/operatorhub/./tools/bundle.py", line 235, in newCSVmods
    csv['metadata']['labels'].update(config["addn-labels"])
    ~~~~~~~~~~~~~~~^^^^^^^^^^
KeyError: 'labels'
make: *** [operator-bundle] Error 1

Changes

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Release Notes

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[tekton-robot]

Hi @l-qing. Thanks for your PR.

I'm waiting for a tektoncd member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[jkhelil]

/approve

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jkhelil

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[jkhelil]

/ok-to-test

[l-qing]

/retest-required