Comment theme('table') called on every comment

The table for the summary of changes at the top of comments is rendered for every comment, even if there is no case changes on that comment.

The if statement surrounding the return statement fixes that problem.

  // Line 794 inside theme_casetracker_comment_changes()
  if (!empty($rows)) {
    return theme('table', NULL, $rows, array('class' => 'case_changes'));
  }

This is my first patch (it's against CVS). Hope it works out well.