Fix nil disks in getOnlineDisksWithHealing (#11419)
Fix nil disks in getOnlineDisksWithHealing (#11419)

If a disk is skipped when nil it is still returned.
donatello/minio,NitishT/minio,vadmeste/minio,balamurugana/minio,krisis/minio,NitishT/minio,NitishT/minio,donatello/minio,NitishT/minio,minio/minio,minio/minio,krisis/minio,balamurugana/minio,vadmeste/minio