coverity#1222233 Division or modulo by zero
coverity#1222233 Division or modulo by zero

Change-Id: I699dc60b67d9417a8ac3848c03d7352f9f8ff12d

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