WordPress Micro Blog gist to hide a specific category from the default feed

functions.php

/* Hide posts with the 'status' category from the default RSS feed but allow them to show in the site specific feed */
function exclude_category($query) {
    if ( $query->is_feed ) {
      if (is_category()) {}
      else {
            $query->set('cat', '-154');
      }
    }
return $query;
}
add_filter('pre_get_posts', 'exclude_category');