coverity#704963 Unchecked dynamic_cast
coverity#704963 Unchecked dynamic_cast

Change-Id: I0dc06f1ffe3a9dfc64cc35ea3c46a237505fe4e8

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