coverity#1251583 Division or modulo by zero
coverity#1251583 Division or modulo by zero

Change-Id: Ib3cb04305a39d652b188d8cff1d63f85074427a0

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