a hub track name loses its hub_<id>_ prefix
  hub_12_myTrack                   -> "myTrack"
  hub_12_my_track_name             -> "my_track_name"
  hub_12_                          -> ""
  hub__myTrack                     -> "myTrack"

a name that starts hub_ with no second underscore is returned whole
  hub_12                           -> the whole name
  hub_                             -> the whole name
  hub_myTrack                      -> the whole name

any other name is returned whole
  knownGene                        -> the whole name
  myhub_12_track                   -> the whole name
  HUB_12_track                     -> the whole name
  hub                              -> the whole name
  (empty string)                   -> the whole name
  NULL                             -> NULL
