coverity#736003 Unchecked dynamic_cast
coverity#736003 Unchecked dynamic_cast

Change-Id: Ie7451b1c96437df444198152230190d07689c1f1

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