[away3d] Bug with perspective lens

[William Fagerstrom]

Hey, I have just found a bug with the perspective lens.

"[Fault] exception, information=ArgumentError: Error #2188: Invalid
raw matrix. Matrix must be invertible."

its from line:

"_projectionMatrix.rawData = Vector.<Number>([_camera.zoom *
_camera.focus,          0,                                                      
        0,      0,
                                                                        0,      
                                                _camera.zoom * _camera.focus,   
        0,      0,
                                                                        0,      
                                                0,                              
                                1,      1,
                                                                        0,      
                                                0,                              
                                0,     0]);"

I only get this error when I run the swf in the projector and not in a
browser.


Also another unrelated bug on line 490 of Collada.as. When you try to
load a file with no geometry data I.e. only bone animation you get a
null reference error.
I fixed it with this though:

_geometryArrayLength = _geometryArray==null?0:_geometryArray.length;