Could not reverse map the HTTPS VirtualHost to the original when whitespace in End of File

Certbot throws "Could not reverse map the HTTPS VirtualHost to the original" when trying to parse a vhost file where the last lines after the closing tag are empty (newline) and/or contain a single space in one of those lines.

This error is really unspecific and i spent lots of time trying to fix it. Also the parser should be able to handle it better. There should be a more specific warning on what file and why its failing.

The Issue and resolving it can be found here https://community.letsencrypt.org/t/could-not-reverse-map-the-https-virtualhost-to-the-original/168559/5 but someone else ran into a similar issue earlier here https://community.letsencrypt.org/t/why-cant-i-certbot-d-toastmastervoice-com-and-create-a-new-virtualhost-and-certificate/131544

This seems to work

```

ServerName md.thorgerjansen.de
DocumentRoot /var/www/html/test

```
Something like this seems to fail (not sure anymore where the space was, just removed the tailing lines and it suddenly worked)
```

ServerName md.thorgerjansen.de
DocumentRoot /var/www/html/test

```

This error is really hard to find and debug and can be really frustrating. Thanks to the people over at community.letsencrypt i solved within 2h what i couldnt solve the day before.