[OMPI users] MPI_Testsome with incount=0, NULL array_of_indices and array_of_statuses causes MPI_ERR_ARG

[Jeremiah Willcock]

On Open MPI 1.5.1, when I call MPI_Testsome with incount=0 and the two 
output arrays NULL, I get an argument error (MPI_ERR_ARG).  Is this the 
intended behavior?  If incount=0, no requests can complete, so the output 
arrays can never be written to.  I do not see anything in the MPI 2.2 
standard that says either way whether this is allowed.

-- Jeremiah Willcock