Fixed a polygon type issue in the LWOLoader.
LightWave polygons of type 'BONE' and 'SUBD' (animation bones and subdivision surfaces) were not being processed at all, sometimes resulting in empty meshes.
git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@623 67173fc5-114c-0410-ac8e-9d2fd5bffc1f