[context] fix treatment of None in env.

[context] fix treatment of None in env.

https://codereview.chromium.org/2925453002 introduced a bug where setting
an envvar to None would set its value to "" instead of removing it from the
environment. This CL restores that behavior.

R=dnj@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2920223011
Committed: https://github.com/luci/recipes-py/commit/c916898b8189866a0bf43fe15c800e4fe6d4a19e

[iannucci, 2017-06-08 00:44:44]

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

[commit-bot: I haz the power, 2017-06-08 00:44:45]

Dry run: CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-06-08 00:47:55]

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

[commit-bot: I haz the power, 2017-06-08 00:47:56]

Dry run: This issue passed the CQ dry run.

[iannucci, 2017-06-08 00:59:41]

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

[commit-bot: I haz the power, 2017-06-08 00:59:50]

Dry run: CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[iannucci, 2017-06-08 01:02:03]

Description was changed from

==========
[context] fix treatment of None in env.

R=dnj@chromium.org
BUG=
==========

to

==========
[context] fix treatment of None in env.

https://codereview.chromium.org/2925453002 introduced a bug where setting
an envvar to None would set its value to "" instead of removing it from the
environment. This CL restores that behavior.

R=dnj@chromium.org
BUG=
==========

[commit-bot: I haz the power, 2017-06-08 01:02:19]

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

[commit-bot: I haz the power, 2017-06-08 01:02:20]

Dry run: This issue passed the CQ dry run.

[dnj, 2017-06-08 01:02:57]

The CQ bit was checked by dnj@chromium.org

[dnj, 2017-06-08 01:02:58]

lgtm

[commit-bot: I haz the power, 2017-06-08 01:03:01]

CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-06-08 01:06:03]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1496883777809960,
"parent_rev": "c40412cbc4e1b8ee1e6eba2e88328ca71c6ec1e4", "commit_rev":
"c916898b8189866a0bf43fe15c800e4fe6d4a19e"}

[commit-bot: I haz the power, 2017-06-08 01:06:05]

Description was changed from

==========
[context] fix treatment of None in env.

https://codereview.chromium.org/2925453002 introduced a bug where setting
an envvar to None would set its value to "" instead of removing it from the
environment. This CL restores that behavior.

R=dnj@chromium.org
BUG=
==========

to

==========
[context] fix treatment of None in env.

https://codereview.chromium.org/2925453002 introduced a bug where setting
an envvar to None would set its value to "" instead of removing it from the
environment. This CL restores that behavior.

R=dnj@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2920223011
Committed:
https://github.com/luci/recipes-py/commit/c916898b8189866a0bf43fe15c800e4fe6d...
==========

[commit-bot: I haz the power, 2017-06-08 01:06:07]

Committed patchset #2 (id:20001) as
https://github.com/luci/recipes-py/commit/c916898b8189866a0bf43fe15c800e4fe6d...