Handle LAGRANGE PRISM20/21 trickiness in Projector
Handle LAGRANGE PRISM20/21 trickiness in Projector

This isn't just an optimization, it prevents us from throwing an error
by asking for a dof_number that isn't there on a triangle center node of
a p=2 Lagrange variable.

libMesh/libmesh,jwpeterson/libmesh,libMesh/libmesh,jwpeterson/libmesh,libMesh/libmesh,libMesh/libmesh,libMesh/libmesh,libMesh/libmesh,jwpeterson/libmesh,libMesh/libmesh,jwpeterson/libmesh,libMesh/libmesh,jwpeterson/libmesh,jwpeterson/libmesh,jwpeterson/libmesh,jwpeterson/libmesh