coverity#1130362 Unchecked dynamic_cast
coverity#1130362 Unchecked dynamic_cast

Change-Id: I58d9c7e933152e0d8ca69125572c820b8dbe7405

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