Add check on returned volumeIds

[jingxu97]

Add string array length check on returned volumeIds to avoid panic issue

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:

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Add string array length check on returned volumeIds to avoid nil pointer issue

[jingxu97]

/test pull-gcp-compute-persistent-disk-csi-driver-kubernetes-integration-windows

[k8s-ci-robot]

@jingxu97: The specified target(s) for /test were not found.
The following commands are available to trigger jobs:

• /test pull-gcp-compute-persistent-disk-csi-driver-e2e
• /test pull-gcp-compute-persistent-disk-csi-driver-sanity
• /test pull-gcp-compute-persistent-disk-csi-driver-unit
• /test pull-gcp-compute-persistent-disk-csi-driver-verify
• /test pull-gcp-compute-persistent-disk-csi-driver-kubernetes-integration
• /test pull-gcp-compute-persistent-disk-csi-driver-e2e-win2019
• /test pull-gcp-compute-persistent-disk-csi-driver-e2e-win1909
• /test pull-gcp-compute-persistent-disk-csi-driver-e2e-windows-1-19

Use /test all to run the following jobs:

• pull-gcp-compute-persistent-disk-csi-driver-e2e
• pull-gcp-compute-persistent-disk-csi-driver-sanity
• pull-gcp-compute-persistent-disk-csi-driver-unit
• pull-gcp-compute-persistent-disk-csi-driver-verify
• pull-gcp-compute-persistent-disk-csi-driver-kubernetes-integration

In response to this:

/test pull-gcp-compute-persistent-disk-csi-driver-kubernetes-integration-windows

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.

[jingxu97]

/test pull-gcp-compute-persistent-disk-csi-driver-e2e-win2019

[jingxu97]

/test pull-gcp-compute-persistent-disk-csi-driver-e2e-win1909

[jingxu97]

/test pull-gcp-compute-persistent-disk-csi-driver-e2e-win1909

[k8s-ci-robot]

@jingxu97: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
pull-gcp-compute-persistent-disk-csi-driver-e2e-win1909	a71a606	link	/test pull-gcp-compute-persistent-disk-csi-driver-e2e-win1909

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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. I understand the commands that are listed here.

[jingxu97]

/assign @Jiawei0227 could you help review? Thanks!

[Jiawei0227]

/lgtm

[Jiawei0227]

/retest

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Jiawei0227, jingxu97

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [jingxu97]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment