[SofaExporter] MeshExporter was crashing when used without a topology.
[SofaExporter] MeshExporter was crashing when used without a topology.

Now it doesn't.

FabienPean/sofa,FabienPean/sofa,FabienPean/sofa,FabienPean/sofa,FabienPean/sofa,FabienPean/sofa,FabienPean/sofa,FabienPean/sofa,FabienPean/sofa,FabienPean/sofa