Avoid unnecessary bad downcast
Avoid unnecessary bad downcast

Change-Id: Ib7ed62599b9e088c4a91a39c3181f3a13e641d70

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