Ihor Radchenko <yantar92@posteo.net> writes:

> AFAIU, `require-final-newline' is t by default, except binary data.
> Also, Org export is not designed to generate binary output.
> So, it should be OK to ensure the final newline manually, in
> `org-export-to-file' - to minimize possible breakage.

See the attached tentative patch.
I am not merging it yet upstream (onto bugfix) in case if there are
objections.