[glTF] Use a default metarial if none is specified#606
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A mesh primitive is not required to specify a material. If the mesh primitive does not specify a material then the spec says to use the default material. The default material uses defaults values where provided. Fixes google#452
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A mesh primitive is not required to specify a material. If the mesh
primitive does not specify a material then the spec says to use the
default material. The default material uses defaults values where
provided.
Fixes #452