File "electrum\gui\qt\settings_dialog.py", line 406, in on_history
  File "electrum\gui\qt\settings_dialog.py", line 378, in update_exchanges
  File "electrum\exchange_rate.py", line 496, in get_exchanges_by_ccy
  File "electrum\exchange_rate.py", line 463, in get_exchanges_by_ccy