coverity#1132667 Unchecked dynamic_cast
coverity#1132667 Unchecked dynamic_cast

Change-Id: Ia1e8a041d1eb1770757731554ab4fe007a62c111

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