Generate stub file

Author: aaltat

src/SeleniumLibrary/__init__.pyi

@@ -123,7 +123,7 @@ class SeleniumLibrary:
     def press_keys(self, locator: Optional[str] = None, *keys: str): ...
     def radio_button_should_be_set_to(self, group_name: str, value: str): ...
     def radio_button_should_not_be_selected(self, group_name: str): ...
-    def register_keyword_to_run_on_failure(self, keyword: str): ...
+    def register_keyword_to_run_on_failure(self, keyword: Union[str, None]): ...
     def reload_page(self): ...
     def remove_location_strategy(self, strategy_name: str): ...
     def scroll_element_into_view(self, locator: str): ...