C-c C-b asks layout with the condition's own name and draws the fields under
it. The values stay refused, by name, because the shape of a condition is a
fact about the build and its contents are a fact about the stopped frame — and
only one of those is knowable today. A layout the daemon refuses is nil rather
than an error: the buffer already draws a section saying why one is empty, and
failing the whole command would take away the restarts over an annotation.