coverity#735760 Unchecked dynamic_cast
coverity#735760 Unchecked dynamic_cast

Change-Id: I0ef7b6a35fe5f23a2572e6a6746fe39567d33079

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