Fix gerrit_util to use non None body.

Fix gerrit_util to use non None body.

Gerrit requires Content-Length to be set for POST requests.
httplib Python library has a bug which doesn't set Content-Length
if the body is empty.

Python BUGS:
https://bugs.python.org/issue14721 (partial fix)
https://bugs.python.org/issue23539 (full fix)

The full fix only appears in 2.7.11 release changelog
(technically, it's been fixed in 2.7.10 rc1, but 2.7.10 was not
released):
https://hg.python.org/cpython/raw-file/53d30ab403f1/Misc/NEWS

R=andybons@chromium.org,szager@chromium.org
BUG=579160
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=299459

[tandrii(chromium), 2016-03-22 23:38:54]

The CQ bit was checked by tandrii@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-03-22 23:38:59]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1827653002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1827653002/1

[commit-bot: I haz the power, 2016-03-22 23:41:29]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-03-22 23:41:30]

Dry run: This issue passed the CQ dry run.

[szager1, 2016-03-23 02:36:52]

lgtm

[tandrii(chromium), 2016-03-24 09:49:39]

The CQ bit was checked by tandrii@chromium.org

[commit-bot: I haz the power, 2016-03-24 09:49:51]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1827653002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1827653002/1

[commit-bot: I haz the power, 2016-03-24 09:52:25]

Description was changed from

==========
Fix gerrit_util to use non None body.

Gerrit requires Content-Length to be set for POST requests.
httplib Python library has a bug which doesn't set Content-Length
if the body is empty.

Python BUGS:
https://bugs.python.org/issue14721 (partial fix)
https://bugs.python.org/issue23539 (full fix)

The full fix only appears in 2.7.11 release changelog
(technically, it's been fixed in 2.7.10 rc1, but 2.7.10 was not
released):
https://hg.python.org/cpython/raw-file/53d30ab403f1/Misc/NEWS

R=andybons@chromium.org,szager@chromium.org
BUG=579160
==========

to

==========
Fix gerrit_util to use non None body.

Gerrit requires Content-Length to be set for POST requests.
httplib Python library has a bug which doesn't set Content-Length
if the body is empty.

Python BUGS:
https://bugs.python.org/issue14721 (partial fix)
https://bugs.python.org/issue23539 (full fix)

The full fix only appears in 2.7.11 release changelog
(technically, it's been fixed in 2.7.10 rc1, but 2.7.10 was not
released):
https://hg.python.org/cpython/raw-file/53d30ab403f1/Misc/NEWS

R=andybons@chromium.org,szager@chromium.org
BUG=579160

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=299459
==========

[commit-bot: I haz the power, 2016-03-24 09:52:26]

Committed patchset #1 (id:1) as
http://src.chromium.org/viewvc/chrome?view=rev&revision=299459