Fix NPE on goto to invalid method reference

[mbien]

• check if element is a record before listing components
• removed reflective method access

reproducer:

public class GoToInvalidMethodReferenceNPE {
    public static void main(String args[]) {
        ChangeListener listener = GoToInvalidMethodReferenceNPE::invalid;
        //                                                       ^^^^^^^ ctrl click (after parsing)
    }
}

fixes #8735

[mbien]

is this cast ok?