coverity#735609 Division or modulo by zero
coverity#735609 Division or modulo by zero

Change-Id: Iaa765c4ed0aa7bb11e74c1c2be48b336158249cc

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