Set "processed" to 0 when "dark" > "white"?

[Bisaloo]

When "dark" > "white", AvaSoft sets the "processed" column to 0. Should we do the same?

It makes sense from a theoretical point of view (the background noise cannot be higher than the reference). But then why not set if to 0 when "dark" > "scope" as well? (AvaSoft doesn't do this)

cc @thomased