In the current LW beta all .succ files I have checked have content on the last line. While very minor is it generally good form to ensure at least one blank line at the end of a text file.
I've seen both styles used intentionally, though the one you suggest is far more common and I agree should probably be the default. Perhaps this should be configurable, part of FileStyle?
As requested here is the issue to track this.
In the current LW beta all .succ files I have checked have content on the last line. While very minor is it generally good form to ensure at least one blank line at the end of a text file.