fix unpublished info missing maintainers cause TypeError
fix unpublished info missing maintainers cause TypeError

marvinlee/cnpmjs.org,limianwang/cnpmjs.org,limianwang/cnpmjs.org,marvinlee/cnpmjs.org,irachex/cnpmjs.org,chinakids/cnpmjs.org,chinakids/cnpmjs.org,limianwang/cnpmjs.org,chinakids/cnpmjs.org,irachex/cnpmjs.org,marvinlee/cnpmjs.org,yufi113/cnpmjs.org,yufi113/cnpmjs.org,irachex/cnpmjs.org,yufi113/cnpmjs.org