Set primary account address as the default

The shipping select no longer defaults to the primary account as
orderFulfillment.getShippingAddress() is no longer null with recent
changes. This checks to see if the addressID returned is an empty string
and if so, sets the accountAddressID to be the account primary
addressID.
Sorry, I just realized that I forgot to put my code in code tags above so it didn't originally render.  Here it is again, I believe this should fix it:

```
<cfelseif orderFulfillment.getShippingAddress().getNewFlag() && not orderFulfillment.getShippingAddress().hasErrors()>
```