coverity#704929 Unchecked dynamic_cast
coverity#704929 Unchecked dynamic_cast

Change-Id: Ic302482419f99ffd221e126006891fa9e97996a7

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