coverity#1169823 Unchecked dynamic_cast
coverity#1169823 Unchecked dynamic_cast

Change-Id: I85e7a3ab7d52e45e827d404b8195a65323b1b38d

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