coverity#704952 Unchecked dynamic_cast
coverity#704952 Unchecked dynamic_cast

Change-Id: If49ed05f54a9c89107d3a2836386c111966d0f54

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