Apologies if this has been asked before, I couldn't find it in the forum.
I am happily working on my theme, the problem I am having is catching wp_die in the comments submission page, wp-comments-post.php. If the user submits no data, the script calls wp_die, which has HTML hard coded in it (oh dear). I actually want the page to be styled like the rest of the site. I looked at http://codex.wordpress.org/Plugin_API/Hooks and could find no hooks to do so.
Of course, I could just edit functions.php, but that would make upgrading a pain.
Any suggestions? Thanks in advance.