Fixed bug in BaseQsub that allows pbs_script to be None.
Fixed bug in BaseQsub that allows pbs_script to be None.

datasnakes/Datasnakes-Scripts,datasnakes/Datasnakes-Scripts,datasnakes/Datasnakes-Scripts,datasnakes/Datasnakes-Scripts,datasnakes/Datasnakes-Scripts,datasnakes/Datasnakes-Scripts