Initialize a DialogNodeOutput object from a json dictionary.

def _from_dict(cls, _dict):
        """Initialize a DialogNodeOutput object from a json dictionary."""
        args = {}
        xtra = _dict.copy()
        if 'generic' in _dict:
            args['generic'] = [
                DialogNodeOutputGeneric._from_dict(x)
                for x in (_dict.get('generic'))
            ]
            del xtra['generic']
        if 'modifiers' in _dict:
            args['modifiers'] = DialogNodeOutputModifiers._from_dict(
                _dict.get('modifiers'))
            del xtra['modifiers']
        args.update(xtra)
        return cls(**args)