fdo#77056: Modify existing test to cover the reported scenario.

Change-Id: I6d0fe13e6756d8b6c3e7ac9ffba828e3f9c2a7b5
fdo#77056: Treat empty cells as if they have a value of 0.0.

Change-Id: Ibe64cf7177a5298c1878e0014c049dc9c82b1344