coverity#735656 Division or modulo by zero
coverity#735656 Division or modulo by zero

Change-Id: I846f5f10649e2f12bac763c87e88cd55135f3d00

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