use null instead of "auto" if no turn dir is indicated
use null instead of "auto" if no turn dir is indicated

ghariman/atc,luznicky/atc,harp71/atc,deepkw/deepkw.github.io,tedrek/atc,ghariman/atc,erikquinn/atc,culebron/atc,luznicky/atc,NoInspiration/ATC,erikquinn/atc,tedrek/atc,deepkw/deepkw.github.io,luznicky/atc,culebron/atc,deepkw/deepkw.github.io,harp71/atc,jpeterson1346/atc,glangford/atc,jpeterson1346/atc,ghariman/atc,MaicomMR/Brazil-Airport,tedrek/atc,harp71/atc,erikquinn/atc,glangford/atc,jpeterson1346/atc,MaicomMR/Brazil-Airport