coverity#704656 Unchecked dynamic_cast
coverity#704656 Unchecked dynamic_cast

Change-Id: Ib70eace7de922983528bdd57ba7cc029647a7090

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