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Automatic merge from submit-queue (batch tested with PRs 37307, 29606, 37986) Allow glusterfs dp volume creation for empty clusterid parameter in sc. Why this patch is needed? The `strings.split()` (https://github.com/kubernetes/kubernetes/pull/37986/files#diff-e97253dd603331ffca81131a4b67264fR700) returns a slice of `single element("empty") ` when the split is attempted on a string. This is expected according to `https://golang.org/pkg/strings/#Split` and `https://github.com/golang/go/issues/13075`. This make the provisioner to fail, if `clusterid` is not defined in the SCs. This patch make sure the split is attempted only when clusterid is mentioned in the sc parameter. Signed-off-by: Humble Chirammal <hchiramm@redhat.com>