coverity#704980 Unchecked dynamic_cast
coverity#704980 Unchecked dynamic_cast

Change-Id: I2947a46228515dec7d826c9b3d36c15921874022

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