coverity#704966 Unchecked dynamic_cast
coverity#704966 Unchecked dynamic_cast

Change-Id: I3a3601c3a13641aea4523438c1e0ee9898b021a0

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