Loading PolyMeshes to OpenFlipper results in unusable normals with values INF/NAN

Load a polymesh with a non-convex polygon (attached) and the halfedge normals as they are stored in OpenMesh are unusable.

Normals are set to value -1.#INF. This doesn't happen for triangle meshes or poly meshes in which all polygons are convex.

attached: starbox.obj: obj file to load containing a star shape polygon. loaded.obj: the mesh as it is stored in OpenMesh after importing