message: Fix MPI extension to work if launched without mpirun/mpiexec
diff: @@ -21,7 +21,7 @@ int nb_test_cases_skipped_insufficient_procs = 0;
  // Record size of MPI_COMM_WORLD with mpi_comm_world_size()
  // so that it can be compared to the MPI_Comm_size value
  // once MPI_Init_thread has been called
  -int world_size_before_init = -1;
  +int world_size_before_init = 1;
  std::string thread_level_to_string(int thread_lvl);
  