Check if all required parameters are set

def check_required_params(self):
        """ Check if all required parameters are set"""
        for param in self.REQUIRED_FIELDS:
            if param not in self.params:
                raise ValidationError("Missing parameter: {} for {}".format(
                    param, self.__class__.path
                ))

        for child in self.TASKS:
            for param in child.REQUIRED_FIELDS:
                if param not in self.params:
                    raise ValidationError(
                        "Missing parameter: {} for {}".format(param, child.path)
                    )