don't crash on trying to change IP interface for Beremiz_service using taskbar icon if IP wasn't previously


By default IP is not set (None) and service listen only on localhost interface.

<?xml version='1.0' encoding='utf-8'?>
<BeremizRoot xmlns:xsd="http://www.w3.org/2001/XMLSchema" URI_location="LOCAL://">
  <TargetType>
    <Linux/>
  </TargetType>
</BeremizRoot>