Incorrect return value in base conversion API

[mountaindude]

The last return be a return null.

        if (request.query.base62 === undefined) {
            // Required parameter is missing
            reply.send(httpErrors(400, 'Required parameter missing'));
        } else {
            const base16 = base62_to_Hex(request.query.base62);
            return { base62: request.query.base62, base16 };
        }

        return {
            response: 'Butler reporting for duty',
            butlerVersion: globals.appVersion,
        };