[away3d] MovieMaterial.autoUpdate = false and update() on first render

[Post Mesteren]

Hello, I'm having issues with MovieMaterials with autoUpdate = false,
especially wrt calling update() on the MovieMaterial instance before
being rendered. I.e., 
  1. Create a Sprite with some contents
  2. Create a new MovieMaterial(contentSprite, {autoUpdate:false,
transparent:false})
  3. Assign material to some object but don't add the object to the scene
yet
  4. Call .update() on the moviematerial

The material is rendered all black. 

I think this happens because the "movie" is only ever rendered by update()
if the _renderBitmap is non-null, but it's null before any calls to
view.render(). 

What do you think about the following patch, which seems to make things
work out nicely?

Index: src/away3d/materials/MovieMaterial.as
===================================================================
--- src/away3d/materials/MovieMaterial.as       (revision 2164)
+++ src/away3d/materials/MovieMaterial.as       (working copy)
@@ -158,7 +158,7 @@
         {
                super.updateMaterial(source, view);
                
-               if (autoUpdate)
+               if (autoUpdate || !rendered)
                 update();
             
             _session = source.session;