coverity#735599 : Division by zero
coverity#735599 : Division by zero

Change-Id: I1a69224793eb39d88894e1090672bdb641c88a02

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