message: defaultSort should be false when no sort is necessary
diff: @@ -44,7 +44,7 @@ function viz(slice, payload) {
  });
  let metrics;
  - let defaultSort = null;
  + let defaultSort = false;
  if (payload.data.is_group_by) {
  metrics = payload.data.columns;
  defaultSort = { column: fd.column_collection[0].key, direction: 'desc' };
  