fix(syncer): sync worker pkg null bug
fix(syncer): sync worker pkg null bug

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