is Scissor Rect correctly removed?

[MattiaFortunati]

I'm not sure the scissor rect is correctly removed at the moment.
Maybe there should be something like:
if self.scissorRect==nil then
self.scissorRect=nil
end

in
RNGroup:remove()
RNObject:remove()

and everywhere else scissor rect is used.

or maybe removing the prop will remove scissorRect, too?