[eluser]jedd[/eluser]
Hi Zebake, and welcome to the forums.
You're allowed to put display-logic into your views, okay?
So you can have your second lump of LI's wrapped in a conditional and just test for whether your _alt stuff is present (isset() should do it).
You may want to investigate the helpers, though, as they can provide a bit nicer code for pushing out a bunch of list items.
You may also want to reconsider your database schema - feel free to post it - as I suspect you are doing this inefficiently (I'm guessing that you have two address fields per person, right?).