coverity#1241199 Unchecked dynamic_cast
coverity#1241199 Unchecked dynamic_cast

Change-Id: I53ace3f34036f2c78201aea7fb4a4a2e7c750654

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