coverity#735646 Division or modulo by zero
coverity#735646 Division or modulo by zero

Change-Id: I0567cfbf73b99f11649a08c73ea67d692691053c

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