coverity#704854 Unchecked dynamic_cast
coverity#704854 Unchecked dynamic_cast

Change-Id: I6d7f6e035bb0dcc86f8aebfdfa4b7f9521bc8820

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