coverity#704770 Unchecked dynamic_cast
coverity#704770 Unchecked dynamic_cast

Change-Id: Ib690d6ad50e89f6cf4b1046fde6bea2d669b971d

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