Fixed crash in DRACOLoader.js when attributeUniqueIdMap was left undefined.
Fixed crash in DRACOLoader.js when attributeUniqueIdMap was left
undefined.

google/draco,google/draco,louquillio/draco,google/draco,louquillio/draco,google/draco,louquillio/draco,google/draco,louquillio/draco,google/draco,louquillio/draco,louquillio/draco,google/draco