[mpiwg-tools] NULL args in pvar_get_info

[Junchao Zhang]

Hello,
  For function "int MPI_T_pvar_get_info(int pvar_index, char *name, int
*name_len, int *verbosity, int *var_class, ...)", MPI_T defines semantics
when name or name_len are NULL.
  But for other args, if they are NULL, is it a user program error or
should we just ignore it? I prefer the latter. But the standard doesn't say
it.

  Thanks
--Junchao Zhang
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