message: Add diagnostics
diff: @@ -1311,6 +1311,9 @@ static void BuildVarList(SstStream Stream, TSMetadataMsg MetaData,
  calloc(sizeof(Info->DataFieldLists[0]), Stream->WriterCohortSize);
  }
  + if (!MetaData->Metadata[WriterRank]->block) {
  + fprintf(stderr, "FAILURE! MetaData->Metadata[WriterRank]->block == NULL for WriterRank = %d\n", WriterRank);
  + }
  FFSformat = FFSTypeHandle_from_encode(
  Stream->ReaderFFSContext, MetaData->Metadata[WriterRank]->block);
  