Dirk Hohndel 74e7b8e879 Don't show a SAC of 0.0l/min (or cuft/min)
When we have no data about the gas consumption it makes no sense to show a
SAC of 0. Instead we should show either "unknown" or nothing.

Fixes #693

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
2014-08-06 07:39:19 -07:00
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