on_conversion_by_page_failed property Leave feedback

The event handler invoked when conversion by page fails.

Honored for back‑compat: the value is merged into the internal events bag at Converter construction (mapping to ConversionEvents.on_page_failed) and is overridden if the same handler is also set on the events constructor parameter.

@property
def on_conversion_by_page_failed(self):
    ...
@on_conversion_by_page_failed.setter
def on_conversion_by_page_failed(self, value):
    ...

• class ConverterSettings