Initialize a OutputData object from a json dictionary.

def _from_dict(cls, _dict):
        """Initialize a OutputData object from a json dictionary."""
        args = {}
        xtra = _dict.copy()
        if 'log_messages' in _dict:
            args['log_messages'] = [
                LogMessage._from_dict(x) for x in (_dict.get('log_messages'))
            ]
            del xtra['log_messages']
        else:
            raise ValueError(
                'Required property \'log_messages\' not present in OutputData JSON'
            )
        if 'text' in _dict:
            args['text'] = _dict.get('text')
            del xtra['text']
        else:
            raise ValueError(
                'Required property \'text\' not present in OutputData JSON')
        if 'generic' in _dict:
            args['generic'] = [
                DialogRuntimeResponseGeneric._from_dict(x)
                for x in (_dict.get('generic'))
            ]
            del xtra['generic']
        if 'nodes_visited' in _dict:
            args['nodes_visited'] = _dict.get('nodes_visited')
            del xtra['nodes_visited']
        if 'nodes_visited_details' in _dict:
            args['nodes_visited_details'] = [
                DialogNodeVisitedDetails._from_dict(x)
                for x in (_dict.get('nodes_visited_details'))
            ]
            del xtra['nodes_visited_details']
        args.update(xtra)
        return cls(**args)