Edit UI: conversion shouldn't show "same as" when addresses are empty

Look for a firm that requires proprietor address data.

Currently, the left address is blank (missing) and right address is "same as".

Start by reproducing the Edit UI for a firm that requires proprietor address data, using the issue's described state: a missing left address and a right address shown as "same as." Trace the address display logic from that screen; done means the UI no longer shows "same as" when the corresponding address is empty.

Written by the indexing model from the issue text.