coverity#1241199 Unchecked dynamic_cast
coverity#1241199 Unchecked dynamic_cast

Change-Id: I8522084c4b6036d63b144af70bf25312f897ff7d

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