[Bf-python] scn.render.render() doesn't work with yafray when called from a command line script.

[Dietrich Bollmann]

Hi, 

When trying to render the default scene with yafray from the command
line, only a white image is generated.  Using the [RENDER] button
directly after the image is rendered correctly.

I used the command

  blender -P render.py

with 'render.py' being as follows:

  import Blender
  scn = Blender.Scene.GetCurrent()
  scn.render.renderer = Blender.Scene.Render.YAFRAY
  scn.render.render()

Do I have to do something else to make yafray render correctly?

Thanks,
Dietrich