message: Update dataset_collection.cc
diff: @@ -263,10 +263,8 @@ void runHttpQuery(std::function<std::vector<MatrixNamedRow> ()> runQuery,
  const auto& columns = sparseOutput[0].columns;
  - // std::vector<std::tuple<ColumnPath, CellValue, Date> > columns;
  -
  if (columns.size() == 0) {
  - connection.sendErrorResponse(400, "Query with atom format returned no column.");
  + connection.sendErrorResponse(400, "Query with atom format returned no columns.");
  return;
  }
  