fix registry_storage_class equals empty string
fix registry_storage_class equals empty string

kubespray/kargo,kubernetes-sigs/kubespray,kubernetes-incubator/kubespray,kubespray/kargo,kubernetes-sigs/kubespray,kubernetes-sigs/kubespray,kubernetes-incubator/kargo,kubernetes-sigs/kubespray,Atoms/kubespray,kubernetes-incubator/kargo,Atoms/kubespray,Atoms/kubespray,kubernetes-incubator/kubespray,Atoms/kubespray