Formatting an empty compilation unit removes any comments

[lucaswerkmeister]

Corner case I found while investigating #68:

/*
 If the file only contains a comment,
 it shouldn’t be removed of course
 */

The formatted code is empty.

[lucaswerkmeister]

So there are two ways to solve this, I think…

• The cheap way is to detect if the CU is empty, and to simply copy input to output in that case. This means that if the comment isn’t indented correctly (i. e., it has leading spaces), we won’t fix that. I’m inclined to think that this would be acceptable, at least for the initial release.
• The right way is to investigate why FormattingWriter.destroy() doesn’t work in this case, and to fix that. This requires more thinking though, and depending on the problem, the fix might be more complicated. So if I run out of time before the initial release, this might not make it.

[lucaswerkmeister]

Fixed, that was a lot easier than I feared :)