When no pressure samples are available the y-axis on right side gets a
bogus legend, this must be fixed and the minimum value is set to zero,
as there is no negative pressure value.
Signed-off-by: Gehad elrobey <gehadelrobey@gmail.com>
Signed-off-by: Miika Turkia <miika.turkia@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>