printing labels for members without address (+ FIX)

If trying to print address labels for a group of members (via the Search menu), if there's 1 member without address no PDF is generated.
The error reported (the offset "3" mentioned is the contact id):

[Mon Aug 08 11:59:26.034306 2016] [:error] [pid 9347] [client 127.0.0.1:35388] PHP Notice: Undefined offset: 3 in /var/www/html/wordpress/wp-content/plugins/civicrm/civicrm/CRM/Member/Form/Task/Label.php on line 137, referer: http://localhost/wordpress/wp-admin/admin.php?page=CiviCRM&q=civicrm%2Fmember%2Fsearch&_qf_Label_display=true&qfKey=0641e9fcfaf46572ba2663d356f59a9c_6506

The reason seems to be this part in CRM/Member/Form/Task/Label.php (line 135-138):

      foreach ($memberships['values'] as $id => $membership) {
        $labelRows[$id] = $rows[$membership['contact_id']];
      }

The $rows variable only contains entries for members that actually have an address, so changing this to:

      foreach ($memberships['values'] as $id => $membership) {
        if (isset($rows[$membership['contact_id']]))
           $labelRows[$id] = $rows[$membership['contact_id']];
      }

should do the trick.