The design studio version I am using is: Release 1.6 SP1 Patch 1 (Version: 16.1.1) The Infochart is working as expected in this version.
green line - Electronics
Blue line - Formula 1
where Formula 1 = Electronics + 0
I get zero value if the data getting from back-end is zero and if the data cell is empty I dont see line in the chart.
Update the DS version and check.