coverity#1078573 Unchecked dynamic_cast
coverity#1078573 Unchecked dynamic_cast

Change-Id: I59d179b2b9ad19de1be2bae517201be038f32c33

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