coverity#735889 Unchecked dynamic_cast
coverity#735889 Unchecked dynamic_cast

Change-Id: Ia55f575f6bfd1d90c2a517db8a76d7d22cdfd6e4

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