CtElementImpl#hasParent(CtElement) may throw a NullPointerException

[msteinbeck]

You will find the following line in hasParent of CtElementImpl:

return getParent() == candidate || getParent().hasParent(candidate);

This assumes, that getParent may not return null. However, in line 50 of CtModelImpl null is explicitly returned:

{
    this.setSimpleName(CtPackage.TOP_LEVEL_PACKAGE_NAME);
    this.setParent(new CtElementImpl() {
        @Override
    public void accept(CtVisitor visitor) {

    }

        @Override
    public CtElement getParent() throws ParentNotInitializedException {
        return null;
    }
    });
}

I got some cases (unfortunately they are to large to post here) in which this results to a NullPointerException.