coverity#1267639: logically dead code in SwUndo::UndoWithContext()
coverity#1267639: logically dead code in SwUndo::UndoWithContext()

Change-Id: I5e41337705bb2952a98e7e5778a217cfb2caccdb

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