def __init__()

in MessagePayload.py [0:0]


    def __init__(self, d, config={'preDropKeys':[], 'postDropKeys':[]}) -> None:
        self.payload = {}
        self.preDropKeys = config.get('preDropKeys')
        if self.preDropKeys is None:
            self.preDropKeys = []
        self.preDropKeys.append('') 
        self.postDropKeys = config.get('postDropKeys')
        if self.postDropKeys is None:
            self.postDropKeys = []
        self._prepare_message(d)