coverity#704972 Unchecked dynamic_cast
coverity#704972 Unchecked dynamic_cast

Change-Id: I8a3a93b9440992b8107aef6b1f4b204b0399fae1

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