coverity#1130377 Unchecked dynamic_cast
coverity#1130377 Unchecked dynamic_cast

Change-Id: I6cb816ec3de711f4faec0e9d676fa9e1127ad175

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