Fields are matched against empty string if node have no body

See issue subject.
I found out that bug is in this code in similar_handler_argument_nid.inc:

    foreach ($this->value as $nid) {
      $node = node_load($nid);
      if (isset($node->title) && isset($node->body) && isset($node->body[$node->language])) {
        // Remove punctuation from the title.
        $title = preg_replace('/[^a-z0-9 _-]+/i', '', $node->title);

Title and body should be added to the string independently. Correct code is something like this:

    foreach ($this->value as $nid) {
      $node = node_load($nid);
      if (isset($node->title) || (isset($node->body) && isset($node->body[$node->language]))) {
        // Remove punctuation from the title.
        $title = preg_replace('/[^a-z0-9 _-]+/i', '', $node->title);