coverity#1194902 Unchecked dynamic_cast
coverity#1194902 Unchecked dynamic_cast

Change-Id: I7a7c8d365e9f90096c98120e448a5571ca5e54a5

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