Nested Properties with Multiple Levels

[nmf2]

Hello, @maoberlehner

First of all, thank you for this project, it has really helped me!

But I believe I've found a bug in it, basically it doesn't work with nested properties which have more than one level. Like so:

propA: {
  propB: {
    propC: "something"
  }
}

If I try to use something like:

mapFields(['propA.propB.propC'])

I get an error saying that I can't access propC of undefined.

[Adrek]

I have same error. When I access to propA level is correct. but when I access level Prop B o C appears this error:
"Property or method "formInfo" is not defined on the instance"