coverity#704499-501 Division by zero
coverity#704499-501 Division by zero

Change-Id: I5f082f10cb6822707a279d5b38ef2936ad2e5c41

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