message: Fixed date for Fetcher function output (TRIVIAL)
diff: @@ -166,7 +166,9 @@ struct FetcherFunction: public ValueFunctionT<FetcherArgs, FetcherOutput> {
  FsObjectInfo info = stream.info();
  ExcAssert(info.exists);
  result.content = ExpressionValue(std::move(blob),
  - info.lastModified);
  + info.lastModified.isADate()
  + ? info.lastModified
  + : Date::now());
  result.error = ExpressionValue::null(Date::notADate());
  }
  MLDB_CATCH_ALL {
  