Checking if artifact image is nil

[jonahjon]

Signed-off-by: jonahjon jonahjones094@gmail.com

Issue #, if available:

Description of changes:

Testing (if applicable):

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[junshun]

/lgtm

[TerryHowe]

/lgtm
/approve

[eks-distro-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: TerryHowe

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[junshun]

/lgtm

[jonahjon]

/cherrypick release-0.12

[eks-distro-pr-bot]

@jonahjon: #4114 failed to apply on top of branch "release-0.12":

Applying: checking if artifact image is nil
Using index info to reconstruct a base tree...
M	release/pkg/helm/helm.go
Falling back to patching base and 3-way merge...
Auto-merging release/pkg/helm/helm.go
CONFLICT (content): Merge conflict in release/pkg/helm/helm.go
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 checking if artifact image is nil
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherrypick release-0.12

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[jonahjon]

/cherrypick release-0.12

[eks-distro-pr-bot]

@jonahjon: new pull request created: #4119

In response to this:

/cherrypick release-0.12

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.