I had covered basically all the pages listed in the Template Hierarchy:
404_template
archive_template
author_template
category_template
tag_template
taxonomy_template
home_template
front_page_template
page_template
search_template
single_template
attachment_template
I'm using the front-page.php for my static front page and home.php for by blog index. So, with all that covered, what should I put into my index.php? Or can I leave it empty?