coverity#735682 Unchecked dynamic_cast
coverity#735682 Unchecked dynamic_cast

Change-Id: Ie3ac1e9960afa71e5cf221bb67b8b8ccb609dc38

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