git-contacts questions

Hi,

I'm currently trying to get git-contacts to work under Windows / MSYS. I have a few issues that may be due to me using the script in a wrong way, or the script having some bugs, so I'd like to ask you for help.

1) Passing just "HEAD" as a committish like in "git contacts HEAD"
does not output anything for me, but using the SHA1 for HEAD does
neither. My HEAD commit does not add any files, but only modifies
previously existing files, so I would have expected some output. In
case it turns out to be correct to have no output in my case, could we
probably say that in some message to the user?

2) For some commits I get error messages from "git blame" in function
get_blame because multiple -L options are specified:

$ git contacts b0783baacd20be7007df40cf274985c4863d63fb fatal: More than one '-L n,m' option given fatal: More than one '-L n,m' option given fatal: More than one '-L n,m' option given fatal: More than one '-L n,m' option given

-L option is allowed, so is this something that needs to be fixed in git-contacts?

Thanks.