coverity#1187662 Unchecked dynamic_cast
coverity#1187662 Unchecked dynamic_cast

Change-Id: Iefe4021d6140614e73f2626f5da7a75a7beea979

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