coverity#735621 Division or modulo by zero
coverity#735621 Division or modulo by zero

Change-Id: Ic92bb6946495124d50e57c2c84995cae6465af92

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