Identify When the table comments exits.

If some one (like me) has installed Node Comments (http://drupal.org/project/nodecomment) it remplace the table comments and include the comments into the table "node".

The problem is when the cron is running it cause a warning because this line in abuse_cron

db_query("DELETE FROM {abuse_status} WHERE type='comment' AND oid NOT IN (SELECT cid FROM {comments})");

is broken.

For example, in the abuse_cron() I add this lines:

  if (db_query('SHOW TABLES LIKE {comments}')) {
    db_query("DELETE FROM {abuse_status} WHERE type='comment' AND oid NOT IN (SELECT cid FROM {comments})");
  }