fix: handle error when listing machines

[ctrox]

What type of PR is this?

/kind bug

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #5656

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[ctrox]

@x13n Saw your issue regarding the upcoming patch release, is it already too late or can I cherry pick this to be included?

[x13n]

I'll be cutting patch releases on Tue/Wed. Note that if you want this change to end up on any of the existing minor branches, you need to cherrypick it there (i.e. to cluster-autoscaler-release-1.XX branches).

[x13n]

Merging this one. In the future, please consider joining the k8s community so you can approve changes for rancher cloudprovider yourself.

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ctrox, ElanHasson, x13n

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