Board Thread:New Features/@comment-24739709-20150518230347/@comment-4731443-20150916170827

I'm not sure about your use case, but why not just use a default group (not horizontal) with no header? Results in the asdfg field below, but doesn't appear if unspecified (provided you don't include a default value as I did for demonstration):

http://i.imgur.com/utsP3C8.png