Robert C. Helling fb09784060 Don't compute SAC if total gas use is unknown
If we breathe from a cylinder with invalid start or
end pressures, we cannot reliably compute the total gas
use and thus the SAC. So we should not pretend to do so.

A better fix would compute the total SAC for only those
segements that have valid start and end pressures.

Reported-by: Stefan Fuchs <sfuchs@gmx.de>
Signed-off-by: Robert C. Helling <helling@atdotde.de>
2018-05-28 09:57:00 +02:00
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