Return a optional infobox

Property definitions

nitc :: htmlight $ ANode :: infobox
	# Return a optional infobox
	fun infobox(v: HtmlightVisitor): nullable HInfoBox do return null
src/htmlight.nit:736,2--737,66

nitc :: htmlight $ AMethid :: infobox
	redef fun infobox(v)
	do
		var p = parent
		if not p isa AMethPropdef then return null
		var mpd = p.mpropdef
		if mpd == null then return null
		return mpd.infobox(v)
	end
src/htmlight.nit:997,2--1004,4