Fix map-branches issues and add coloring for 'branch-heads',

Fix map-branches issues and add coloring for 'branch-heads',

This CL fixes some issues with map-branches:
* Branches with no upstream were not being shown.
* -vv from a detached HEAD would crash
* GONE upstreams would crash when git cleaned up in a way that caused
  hash_one to fail

This CL also adds a blue coloring to branches that start with
'branch-heads' for Chromium release branches.

BUG=416530
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=292083

[calamity, 2014-09-18 01:53:01]

calamity@chromium.org changed reviewers:
+ iannucci@chromium.org

[iannucci, 2014-09-23 00:42:01]

oops, sorry, lgtm.

Could you add the (new) bug too?

https://codereview.chromium.org/576423002/diff/1/git_map_branches.py
File git_map_branches.py (right):

https://codereview.chromium.org/576423002/diff/1/git_map_branches.py#newcode161
git_map_branches.py:161: color = Fore.BLUE
could you regenerate the manpage to show this, too?

[calamity, 2014-09-23 03:20:50]

The CQ bit was checked by calamity@chromium.org

[calamity, 2014-09-23 03:21:20]

The CQ bit was unchecked by calamity@chromium.org

[calamity, 2014-09-23 03:28:01]

https://codereview.chromium.org/576423002/diff/1/git_map_branches.py
File git_map_branches.py (right):

https://codereview.chromium.org/576423002/diff/1/git_map_branches.py#newcode161
git_map_branches.py:161: color = Fore.BLUE
On 2014/09/23 00:42:01, iannucci wrote:
> could you regenerate the manpage to show this, too?

Done.

[calamity, 2014-09-23 03:28:07]

The CQ bit was checked by calamity@chromium.org

[commit-bot: I haz the power, 2014-09-23 03:28:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/576423002/40001

[commit-bot: I haz the power, 2014-09-23 03:30:52]

Committed patchset #3 (id:40001) as 292083