bnc#812796: Don't create data series when the series has no values.
bnc#812796: Don't create data series when the series has no values.

Change-Id: I92e2d7a3fab0948aea0557cf3cb65d57d48f3f59

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core