[Papervision3D] DAE parser fix for ColladaMAX NextGen

[Cauê Waneck]

I was having some difficulties having the DAE parser read an animation
generated with ColladaMAX NextGen, and tracing through the problem, I
arrived at a null reference on DaeDocument.as

var animNode:XML = getNodeById( animLib, ASCollada.DAE_ANIMATION_ELEMENT,
animation.id );

animation.id was null in the case.
I got it fixed by changing this line to:

if ( (animation.id == null) || (animation.id == "") )
var animNode:XML = getNode( animLib, ASCollada.DAE_ANIMATION_ELEMENT);
else
animNode = getNodeById( animLib, ASCollada.DAE_ANIMATION_ELEMENT,
animation.id );

Now everything works fine.

I don't think this fix will break anything, but I don't think so, as it just
prevents from unexpected null referencing. So if you are having a hard time
playing a DAE animation from ColladaMax NextGen, maybe this will help you
too.

Cheers!
Caue
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