Merge pull request #4155 from tssurya/fix-ensureTransitSwitch

Fix ensureTransitSwitch from failing if there are no nodes

go-controller/pkg/ovn/zone_interconnect/zone_ic_handler.go

@@ -176,6 +176,9 @@ func (zic *ZoneInterconnectHandler) createOrUpdateTransitSwitch(networkID int) e
 // ensureTransitSwitch sets up the global transit switch required for interoperability with other zones
 // Must wait for network id to be annotated to any node by cluster manager
 func (zic *ZoneInterconnectHandler) ensureTransitSwitch(nodes []*corev1.Node) error {
+	if len(nodes) == 0 { // nothing to do
+		return nil
+	}
 	start := time.Now()
 
 	// first try to get the network ID from the current state of the nodes