private boolean isNullable(@Nullable PsiModifierListOwner owner) {
        if (owner == null) return false;
        if (NullableNotNullManager.isNullable(owner)) {
            return true;
        }
        PsiType type = getType(owner);
        if (type == null) return false;
        return isNullable(type);
    }
private boolean isNullable(@Nullable PsiModifierListOwner owner)