omitted '(no author)' line from contributor list.

One of my old repos has moved cvs -> svn -> git, unfortunately cvs2svn command replaced unknown author commit like below:

```
commit 4989a20276c897d9f296a348c2767e95f33d6fe9
Author: (no author) <(no author)@190414af-bbfa-0310-9d04-6f9e040fc871>
Date:   Wed Jun 23 11:11:44 2004 +0000

    New repository initialized by cvs2svn.
```