Display of {S#|P#} reference

[StevenClontz]

I agree that I prefer

Space is [not] Property

over the current

Space | Property

See #66 (comment)_

[jamesdabbs]

Question: how would you want it to display if the trait value is unknown? (Probably not a common case, but "has bearing on this open question" could be a thing)

See https://github.com/pi-base/web/pull/80/files#diff-3107c9caf729e34120e660b61bc042f145a2af129e08c1affedf84b2d7e6b491R25