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34c546b9cd61e075dfabef2846d5e2f0907e7b17
MPI_COMM_NULL is not a valid argument for MPI_Topo_test. But it is used to indicated leftover processes when creating graph communicator or cartesians grids (for exampl, when you create a 2X2 grid from a 5 process communicator). So we need to deal with it as a special case.
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