Inverted sections rendered incorrectly for existing values

[kyrel]

This block of code in SectionToken.render:

    case str:String => StringProduct(str)

    case other =>
      composite(children, other, partials, callstack)

---

does not check if the section is inverted or not so it should better be

case str:String => if (!inverted) StringProduct(str) else EmptyProduct
case other => if(!inverted) composite(children, other, partials, callstack) else EmptyProduct

[vspy]

fixed