Fbx importer create unused material

1. Create a multisub material in max
2. add some material and leave some entry empty
3. map a cube with the multisub material
4. export to fbx
5. import the fbx in UE4

Expected: we should import only material use by faces
Result: all material (even empty slot are imported)

UE-88880 - Public Discussion

Fix UE-51650

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