Hi,

I got a lot of warnings in my applications due to the fact that the FBX plugin 
was trying to load textures with invalid paths. The problem came from the 
following code section:

https://github.com/openscenegraph/OpenSceneGraph/blob/5feb9e58f72297bdc53695d7224b5d42cdbcb746/src/osgPlugins/fbx/fbxMaterialToOsgStateSet.cpp#L179-L181

The problem was that in my case the first tried path was always invalid 
resulting in a fired osg::WARN inside the osgDB::readRefImageFile function.

My solution checks the existence of the suggested path before trying to call 
readRefImageFile function.

Submitted as:
https://github.com/openscenegraph/OpenSceneGraph/pull/544

Regards,
Björn

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