coverity#735765 Unchecked dynamic_cast
coverity#735765 Unchecked dynamic_cast

Change-Id: I4a1bf64267d36ff4b3b7cf0ba2cc23c52ec2d36e

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