Lots of warnings when comment/block modules are not installed

I have this D6 site (with i18n, without comments) and I was getting a lot of warning like this (once per node or link) :

User warning: Table web.node_comment_statistics doesn't exist query: SELECT last_comment_timestamp, last_comment_name, comment_count FROM node_comment_statistics WHERE nid = 19 in _db_query() (line 169 of /..../drupal/includes/database.mysqli.inc).
User warning: Table web.comments doesn't exist query: SELECT COUNT(*) FROM comments c WHERE c.nid = 19 in _db_query() (line 169 of /..../drupal/includes/database.mysqli.inc).
User warning: Table web.comments doesn't exist query: SELECT c.cid as cid, c.pid, c.nid, c.subject, c.comment, c.format, c.timestamp, c.name, c.mail, c.homepage, u.uid, u.name AS registered_name, u.signature, u.signature_format, u.picture, u.data, c.thread, c.status FROM comments c INNER JOIN users u ON c.uid = u.uid WHERE c.nid = 19 ORDER BY c.thread DESC LIMIT 0, 50 in _db_query() (line 169 of /..../drupal/includes/database.mysqli.inc).

Here's a patch against latest 6.x-dev that fixes it.