fatal: ambiguous argument '': unknown revision or path not in the working tree.

Hi all,

I'm getting this error from most cogito commands in my repository (created with cg-init):

===
$ cg status
Heads:
   >master      66ef937771695c865e38ff7227c077d9260759ce

? patches/series fatal: ambiguous argument '': unknown revision or path not in the working tree. Use '--' to separate paths from revisions ===

I already have some commits and history in there that I'd prefer not to loose. When I clone this repository the error disappears but I'd prefer to fix it in place.

Any ideas?

Using cogito-0.17 and git-1.4.0

Thanks

Michal