Code review comment for lp:~stolowski/unity/expand-2nd-home-category

Unfortunately there is no way to do this from lenses. Ideally, we should have a new expand-in-home-on-empty-search lens property in libunity Lens class, that would be passed via existing as{v} hints over DBus. I discussed this with Neil and he suggested handling it as an edge case on unity side only, as it's sanest for 12.10.