Automated cherry pick of #122704: If a pvc has an empty storageclass name, don't try to assign

[carlory]

Cherry pick of #122704 on release-1.26.

#122704: If a pvc has an empty storageclass name, don't try to assign

For details on the cherry pick process, see the cherry pick requests page.

Fixes a regression in 1.26+ default configurations: If a pvc has an empty storageClassName, persistentvolume controller won't try to assign a default StorageClass

[carlory]

/cc @jsafrane @RomanBednar

[k8s-ci-robot]

@carlory: Those labels are not set on the issue: sig/network, area/kube-proxy

In response to this:

/remove-sig api-machinery
/remove-sig architecture
/remove-sig auth
/remove-sig cli
/remove-sig cloud-provider
/remove-sig cluster-lifecycle
/remove-sig instrumentation
/remove-sig network
/remove-sig node
/remove-area kubectl
/remove-area kube-proxy
/remove-area code-generation
/remove-area dependency

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[jsafrane]

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 41735b83ca45de52cd96f04ba30e6d6c090fa4fc

[bart0sh]

/triage accepted
/priority important-soon
/cc kubernetes/release-managers

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: carlory, jsafrane, saschagrunert

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Needs approval from an approver in each of these files:

• pkg/controller/volume/persistentvolume/OWNERS [jsafrane]
• staging/src/k8s.io/component-helpers/storage/OWNERS [jsafrane]

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