check for identity in operator=()
check for identity in operator=()

Change-Id: I687dc4bdd3093054a6e2c1fd383cfc2a8c948303

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