:bug: Fix error-return for machine-cluster association

[kashifest]

What this PR does / why we need it: Removes error and waits again if

a) machine does not have any associated cluster b) Machine has associate cluster but it is till non-existent

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged): Fixes #212

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: kashifest To complete the pull request process, please assign fabriziopandini You can assign the PR to them by writing /assign @fabriziopandini in a comment when ready.

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[k8s-ci-robot]

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