[Boost-mpi] Glitch with MPI_Topo_test usage

Subject: [Boost-mpi] Glitch with MPI_Topo_test usage
From: Alain Miniussi (alain.miniussi_at_[hidden])
Date: 2014-10-06 18:54:31

Hi,

I have a small pull request related to the fact that we do not handle 
MPI_COMM_NULL when probing topology.

I think it trivial but if anyone has a comment ?

https://github.com/boostorg/mpi/pull/20

Thanks

Alain