coverity#1291170 unchecked dynamic_cast
coverity#1291170 unchecked dynamic_cast

Change-Id: I6d141fcaff4877cfee6400f104d3c41fd967d6f3

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