coverity#704849 Unchecked dynamic_cast
coverity#704849 Unchecked dynamic_cast

Change-Id: If22324ea65a45ac93f6c4b9cbaf9cfb11ef91195

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