coverity#705043 Unchecked dynamic_cast
coverity#705043 Unchecked dynamic_cast

Change-Id: I554cda341894bbf35c16cdf0d9eb77ffea32f5e2

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