coverity#1209405 Unchecked dynamic_cast
coverity#1209405 Unchecked dynamic_cast

Change-Id: I5b16007b514169e2349c8c3a78d3c150c9d52d85

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