Fix issue when the storage class of a persistent volume is empty and add test #6615
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What does this PR do?
Fix an issue when the storage class of a persistent volume is empty.
Adds a test for this use case.
Motivation
Customer reported this issue because some of their persistent volumes did not have a storage class.
This can happen if persistent volumes are restored.
Additional Notes
Review checklist (to be filled by reviewers)
changelog/
andintegration/
labels attached