default T12 getOrNull12() {
        return get12().orElse(null);
    }
Returns the 12nd element from this tuple or {@code null} if no such
element is present.

@return the 12nd element from this tuple or {@code null} if no such
        element is present.
common-parent/tuple/src/main/java/com/speedment/common/tuple/nullable/Tuple15OfNullables.java