Показать определенную ошибку

    @Override
    public void initData() {
        addToCompDisp(Single.concat(getProducts(), getEmployers(), getMenu())
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .doOnSubscribe(data -> getView().showInitLoading())
                .doOnError(data -> getView().initError())
                .subscribe(data -> {
                        },
                        throwable -> {
                            handleError(throwable, R.string.init_error);
                        },
                        () -> {
                            getView().showMainLayout();
                            getView().showMenu(parseMenu());
                        })
        );
    }

    private Single<List<Employe>> getEmployers() {
        return RetrofitFactory.getRetrofitService().getEmployers(mDataManager.getLsId(), mDataManager.getBidId())
                .doOnSuccess(list -> mDataManager.getEmployeStorage().setEmployes(list))
                .doOnError(throwable -> getView().showToast(R.string.init_error_get_employers))
                .flatMap(list -> Single.error(new Throwable("Custom error")));
    }

    private Single<List<Main>> getMenu() {
        return RetrofitFactory.getRetrofitService().getMenu(mDataManager.getLsId(), mDataManager.getBidId())
                .doOnSuccess(menu -> mDataManager.setMenu(menu))
                .doOnError(throwable -> getView().showToast(R.string.init_error_get_menu));
    }


    private Single<ResponseBody> getProducts() {
        return RetrofitFactory.getRetrofitService().getProducts(mDataManager.getLsId(), mDataManager.getBidId())
                .doOnSuccess(responseBody -> parseProducts(responseBody.string()))
                .doOnError(throwable -> getView().showToast(R.string.error_get_products));
    }