Traceback (most recent call last):
  File "electrum/gui/qt/util.py", line 944, in on_done
  File "/Applications/Electrum.app/Contents/MacOS/electrum/plugins/trezor/qt.py", line 504, in update
    pin_set_label.setText(noyes[features.pin_protection])
TypeError: list indices must be integers or slices, not NoneType