message: Do not silence error message for query.
diff: @@ -119,6 +119,7 @@ class BaseViz(object):
  # parsing logic.
  if df is None or df.empty:
  self.status = utils.QueryStatus.FAILED
  + if not self.error_message:
  self.error_message = "No data."
  return pd.DataFrame()
  else:
  