I have a method that has the default argument set to "None". (it can be string as well)

@allure.step(
    "Send message: '{message}' on {channel} with props: '{props}'")
def send_message(
        self,
        channel: str,
        message: str,
        username: str = None,
        props: Dict = None) -> None:
    ...

Calling this method without the props parameter:

self.bot.send_message(
       channel=self.DZIUNIA['mm_channel_id'],
       message=letter)

causes a Python exception:

E KeyError: 'props'