Method is_empty

sql/sql_error.h:736–736

Do we have any errors and warnings that we can *show*? */

  /** Do we have any errors and warnings that we can *show*? */
  bool is_empty() const { return m_warn_list.is_empty(); }

  /** Increment the current row counter to point at the next row. */
  void inc_current_row_for_warning() { m_current_row_for_warning++; }