Don't throw on undefined options when nodes are equal
Don't throw on undefined options when nodes are equal

Fixes #261

globexdesigns/react-dnd,longlho/react-dnd,tylercollier/react-dnd-demo,tylercollier/react-dnd-demo,globexdesigns/react-dnd,jgable/react-dnd,jgable/react-dnd,longlho/react-dnd