def get_parser_attr(self, attr=None, agent=None):
        if not attr or not self.parser:
            return []
        try:
            return getattr(self.parser, attr)
        except:
            return []
Indicate whether this object is changed from the version in
dataset/ETHPy150Open ziirish/burp-ui/burpui/misc/backend/burp1.py/Burp.get_parser_attr--crossover with--dataset/ETHPy150Open ebroder/anygit/anygit/backends/mongodb.py/MongoDbModel.changed