[PATCH STABLE] rebase: fix rebase with no common ancestors (issue4446)

[Augie Fackler]

On Mon, Nov 10, 2014 at 2:11 PM, Jordi Gutiérrez Hermoso
<jordigh at octave.org> wrote:
>> rebase: fix rebase with no common ancestors (issue4446)
>
> I was working on this, and your fix lgtm. Below I get more picky about
> the test you added, but I guess it's ok as it is, if you don't think
> it needs anything more.


I'm not /too/ worried about additional tests, but if you have extra
testcases we could test, please mail them for default?