Fix IndexOutOfRange exception in CreateDefaultVertexArray.
Added test.
Revert "Fix IndexOutOfRange exception in CreateDefaultVertexArray."

This reverts commit ff49349d3392b6a90c8b148e042af16ac7df23a1.
Updated model. Only mesh without normals produces the error.
Fix IndexOutOfRange exception in CreateDefaultVertexArray.
Merge pull request #54 from dermeister0/feature/create_default_vertex_array

HelixToolkit.Wpf.SharpDX: Fix IndexOutOfRange exception in CreateDefaultVertexArray.