Generate utility method to check if a List child is non-empty

[Jesper Öqvist]

It would be useful if JastAdd generated a utility method for each list child to check if the list contains at least one item. Example:

A ::= B*;

New utility method code:

public boolean A.hasB() {
    return getNumB() > 0;
}

And add

public boolean List.isEmpty() { ... }

[Görel Hedin]

The has-method has been added in f7e7f00. The List.isEmpty method is not yet added.

[Görel Hedin]

Closing this issue. Moving the isEmpty issue to #139.

[Görel Hedin]

Yes, closing it...