add failing test for nested children with 0 children
add failing test for nested children with 0 children

vincentwoo/jbuilder,rails/jbuilder,sue445/jbuilder,nambrot/jbuilder,jasnow/jbuilder,WellframeInc/jbuilder,ASnow/jbuilder,maclover7/jbuilder,odedniv/jbuilder,suryasnath/Venture