Error with NoneType opening Options menu

Clicking on `Edit > Options...` gives :

```Traceback (most recent call last):
  File "/[venv path]/lib/python3.12/site-packages/pyncview/pyncview.py", line 1030, in onEditOptions
    cb.setChecked(self.settings['MaskValuesOutsideRange'].getValue(usedefault=True))
TypeError: setChecked(self, a0: bool): argument 1 has unexpected type 'NoneType'
```