Fix a bug in bulk dedup

        last_mapping = current_min_mapping;

        last_rid = min_rid;

        dup_count = 1;

        if (remove_pcr_duplicates_at_bulk_level_) {

          temp_dups_for_bulk_level_dedup.push_back(current_min_mapping);

          temp_dups_for_bulk_level_dedup.back().num_dups = 1;

        }

      }

      temp_mapping_file_handles_[min_handle_index].Next(num_reference_sequences);

    }