coverity#1169831 Unchecked dynamic_cast
coverity#1169831 Unchecked dynamic_cast

Change-Id: I26cdb42dce390b899bc2628eedd4157d6457fcde

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