Searching for empty rune sockets

There have been some great changes to the trade site this patch (Being able to target specific notable allocations and time-lost jewel mods, for example.)

But I noticed that the "empty rune sockets" filter has been replaced with just "rune sockets." This is great in many cases - trying to find items that have two sockets even if in use was a hassle before.

But the thing is, we still need to be able to search for empty sockets as well. How else can we spot items that might hit our other requirements if we slot the right runes?

Is there any way to filter by empty sockets now that I've somehow missed? Or even better, to be able to search by what runes are socketed?

Thanks in advance!

You can change runes on gear now!

You are now able to overwrite any socketed runes with your choice.

I know we can overwrite runes - if anything, that makes this feature more important. If I'm trying to maximize evasion rating, I want to see pieces that have empty sockets or sockets with other runes that I could put iron runes in.