coverity#705026 Unchecked dynamic_cast
coverity#705026 Unchecked dynamic_cast

Change-Id: I76aeefc705481249b0197839a9db3eecb34adc92

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