change layout from nil to null
change layout from nil to null

scott17090025902/scott17090025902.github.com,JohnnyYin/johnnyyin.github.io,JohnnyYin/johnnyyin.github.io,luzhengfa/luzhengfa.github.io,JohnnyYin/johnnyyin.github.io,luzhengfa/luzhengfa.github.io,scott17090025902/scott17090025902.github.com,JohnnyYin/johnnyyin.github.io,aniux/aniux.github.io,scott17090025902/scott17090025902.github.com,aniux/aniux.github.io