coverity#735763 Unchecked dynamic_cast
coverity#735763 Unchecked dynamic_cast

Change-Id: I4b8a0ebc846ee91530d28821643b3d2f98c0d4f2

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