Added workaround for 3dsMax Boolean operation (and other similar operations) that assign null vertex color in-engine #852
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Fix was targeted towards 3dsMax scene:
Forum_3dsmax-after-exporting-boolean-object-loses-its-texture.zip
https://forum.babylonjs.com/t/3dsmax-after-exporting-boolean-object-loses-its-texture/12004/3
Fix checks vertex color buffer for non-zero values, and only exports if a value is non-zero.