[PATCH 2 of 2 hggit-ext] stop dying if extras is malformed

[Ryan McElroy]

On 9/9/2016 2:13 PM, Augie Fackler wrote:
> In the future please send hg-git patches to the
> correct mailing list per CONTRIBUTING.

Whoops, thanks for taking them anyway! I'll have another patch or two 
incoming to fix breakages from upstream hg changes.

Cheers,

~Ryan