coverity#704674 Unchecked dynamic_cast
coverity#704674 Unchecked dynamic_cast

Change-Id: I4432ad08fe149e299933443fb6f1c6afc0746cf5

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