don't return empty list when there are no return values (#157)
don't return empty list when there are no return values (#157)


ray-project/ray,atumanov/ray,ujvl/ray-ng,robertnishihara/ray,stephanie-wang/ray,amplab/ray,ray-project/ray,ray-project/ray,robertnishihara/ray,stephanie-wang/ray,pcmoritz/ray-1,atumanov/ray,atumanov/ray,stephanie-wang/ray,ujvl/ray-ng,stephanie-wang/ray,ray-project/ray,robertnishihara/ray,alanamarzoev/ray,amplab/ray,robertnishihara/ray,richardliaw/ray,alanamarzoev/ray,Wapaul1/ray,ray-project/ray,Wapaul1/ray,robertnishihara/ray,stephanie-wang/ray,robertnishihara/ray,stephanie-wang/ray,ray-project/ray,ray-project/ray,amplab/ray,robertnishihara/ray,Wapaul1/ray,pcmoritz/ray-1,richardliaw/ray,pcmoritz/ray-1,richardliaw/ray,Wapaul1/ray,richardliaw/ray,pcmoritz/ray-1,amplab/ray,atumanov/ray,ujvl/ray-ng,richardliaw/ray,alanamarzoev/ray,richardliaw/ray,Wapaul1/ray,stephanie-wang/ray,robertnishihara/ray,atumanov/ray,stephanie-wang/ray,ujvl/ray-ng,robertnishihara/ray,atumanov/ray,alanamarzoev/ray,atumanov/ray,pcmoritz/ray-1,pcmoritz/ray-1,alanamarzoev/ray,richardliaw/ray,pcmoritz/ray-1,alanamarzoev/ray,atumanov/ray,Wapaul1/ray,stephanie-wang/ray,richardliaw/ray,pcmoritz/ray-1,ray-project/ray