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Crash halfway on itemCount 0 must be greater than or equal to 1

See original GitHub issue

Command:

docker run \
	-v $(pwd)/data/tiles:/app/output \
	-it geodan/pg2b3dm \
	-h metis -U tomt -d maquette_nl -p 5433 \
	-t tmp.betterroofs_extruded

output:

tool: pg2b3dm 0.3.1.0
Start processing....
Calculating bounding boxes...
Writing tileset.json...
Writing 24 tiles...
Progress: tile 7 - 29.17%
Unhandled Exception: System.ArgumentOutOfRangeException: itemCount 0 must be greater than or equal to 1.
Parameter name: itemCount
   at SharpGLTF.Guard.MustBeGreaterThanOrEqualTo[TValue](TValue value, TValue min, String parameterName)
   at SharpGLTF.Schema2.Accessor.SetData(BufferView buffer, Int32 bufferByteOffset, Int32 itemCount, DimensionType dimensions, EncodingType encoding, Boolean normalized)
   at SharpGLTF.Schema2.Accessor.SetVertexData(BufferView buffer, Int32 bufferByteOffset, Int32 itemCount, DimensionType dimensions, EncodingType encoding, Boolean normalized)
   at SharpGLTF.Schema2.Accessor.SetVertexData(MemoryAccessor src)
   at SharpGLTF.Schema2.Schema2Toolkit.CreateVertexAccessor(ModelRoot root, MemoryAccessor memAccessor)
   at SharpGLTF.Schema2.Schema2Toolkit.WithVertexAccessor(MeshPrimitive primitive, MemoryAccessor memAccessor)
   at SharpGLTF.Schema2.Schema2Toolkit.WithVertexAccessors(MeshPrimitive primitive, IEnumerable`1 memAccessors)
   at SharpGLTF.Geometry.PackedPrimitiveBuilder`1.CopyToMesh(Mesh dstMesh, Func`2 materialEvaluator)
   at SharpGLTF.Geometry.PackedMeshBuilder`1.CreateSchema2Mesh(ModelRoot root, Func`2 materialEvaluator)
   at SharpGLTF.Schema2.Schema2Toolkit.CreateMeshes[TMaterial,TvP,TvM,TvS](ModelRoot root, Func`2 materialEvaluator, MeshBuilder`4[] meshBuilders)
   at pg2b3dm.Program.WriteB3dm(List`1 geomrecords, Int32 tile_id) in /src/pg2b3dm/Program.cs:line 171
   at System.Threading.QueueUserWorkItemCallbackDefaultContext.Execute()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
   at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback()