coverity#1130351 Unchecked dynamic_cast
coverity#1130351 Unchecked dynamic_cast

Change-Id: Ib0ae5dcd616c4a579f73fbd26675f8b2f60f0666

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