fix instance id may be empty issue

Author: RainbowMango

cluster-autoscaler/cloudprovider/huaweicloud/huaweicloud_service_manager.go

@@ -179,6 +179,11 @@ func (csm *cloudServiceManager) GetInstances(groupID string) ([]cloudprovider.In
 
 	instances := make([]cloudprovider.Instance, 0, len(*response.ScalingGroupInstances))
 	for _, sgi := range *response.ScalingGroupInstances {
+		// When a new instance joining to the scaling group, the instance id maybe empty(nil).
+		if sgi.InstanceId == nil {
+			klog.Infof("ignore instance without instance id, maybe instance is joining.")
+			continue
+		}
 		instance := cloudprovider.Instance{
 			Id:     *sgi.InstanceId,
 			Status: csm.transformInstanceState(*sgi.LifeCycleState, *sgi.HealthStatus),