coverity#704860 Unchecked dynamic_cast
coverity#704860 Unchecked dynamic_cast

Change-Id: I4a6cf43eaf9626bdb1d486476d3e797fcab5ab13

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