coverity#982479 Unchecked dynamic_cast
coverity#982479 Unchecked dynamic_cast

Change-Id: I79f02538a44edb7fb7c1b94dbec365a30d896bb4

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