Edit comment link causes PHP notices and is visible by unauthroized users if no comment exists

My View spews a bunch of these:

Notice: Trying to get property of non-object in views_handler_field_comment_link->render_link() (regel 55 van sites/all/modules/contrib/views/modules/comment/views_handler_field_comment_link.inc).
Notice: Trying to get property of non-object in views_handler_field_comment_link->render_link() (regel 56 van sites/all/modules/contrib/views/modules/comment/views_handler_field_comment_link.inc).
Notice: Trying to get property of non-object in comment_access() (regel 1447 van modules/comment/comment.module).
Notice: Trying to get property of non-object in views_handler_field_comment_link_edit->render_link() (regel 48 van sites/all/modules/contrib/views/modules/comment/views_handler_field_comment_link_edit.inc).

because my View has a Comment: Child comment relationship that doesn't always return a comment.

views_handler_field_comment_link::render() doesn't check if there's a comment to render an edit link for:

  function render($values) {
    $value = $this->get_value($values, 'cid');
    return $this->render_link($this->sanitize_value($value), $values);
  }

The above $value is empty if there's no comment, the cid otherwise.

Fix is easy:

  function render($values) {
    $value = $this->get_value($values, 'cid');
    if (!$value) {
      return '';
    }
    return $this->render_link($this->sanitize_value($value), $values);
  }

If there's no comment, don't render an edit link.