GLB / GLTF export of instanced meshes only

Hi,
There is a problem when exporting only instanced meshes using GLTF2Export.
It seems like this only happens after GLTF Serializer rework.

Exporting source mesh together with instanced mesh fixes the issue.
Repro: Babylon.js Playground

pinging @alexchuber

Welcome to the community, and thanks for the report!

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You should be able to export instanced meshes without their source mesh after this PR:

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