Don't do fragment transactions if fragment is destroyed

     * Hides the search fragment

     */

    private void exitSearchUi() {

        // See related bug in enterSearchUI();

        if (getFragmentManager().isDestroyed()) {

            return;

        }

        // Go all the way back to the favorites fragment, regardless of how many times we

        // transitioned between search fragments

        final BackStackEntry entry = getFragmentManager().getBackStackEntryAt(0);