assert non-nullness of interface before use
assert non-nullness of interface before use

Change-Id: I467830dce80e97db1b20c6d589fb4ca407cfa26c

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