coverity#1130368 Unchecked dynamic_cast
coverity#1130368 Unchecked dynamic_cast

Change-Id: Ib4ae0ce1647e15bf1b9d7fe8e2d3bcfcb8ec1466

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