In the topic list the anonymous author item wrongly get a link pointing to the user profile of the last comment author

I've found that in forum.module line 1126 in template_preprocess_forum_topic_list(&$variables) function there is the following instruction:

  ...
  $topic->uid = $topic->last_comment_uid ? $topic->last_comment_uid : $topic->uid; // line 1126
  $variables['topics'][$id]->created = theme('forum_submitted', array('topic' => $topic));
  $variables['topics'][$id]->last_reply = theme('forum_submitted', array('topic' => isset($topic->last_reply) ? $topic->last_reply : NULL));
  ...

This line is what trigger this issue and removing it result in what is expected in regard to this issue so the attached patch just comment it.

The question now is: for what this line is use for and what are the consequences of commenting it?

#1: remove_added_topic_uid-1181240.patch queued for re-testing.

I didn't find any consequence issues when removing the line 1126.