Add null check in createDistracterFilter().

    private DistracterFilter createDistracterFilter() {

        final MainKeyboardView mainKeyboardView = mKeyboardSwitcher.getMainKeyboardView();

        final Keyboard keyboard = mainKeyboardView.getKeyboard();

        // TODO: Create Keyboard when mainKeyboardView is null.

        // TODO: Figure out the most reasonable keyboard for the filter. Refer to the

        // spellchecker's logic.

        final Keyboard keyboard = (mainKeyboardView != null) ?

                mainKeyboardView.getKeyboard() : null;

        final DistracterFilter distracterFilter = new DistracterFilter(mInputLogic.mSuggest,

                keyboard);

        return distracterFilter;