Make setup_links.py not fail if Chromium checkout is missing.

Make setup_links.py not fail if Chromium checkout is missing.

If a checkout has been created but haven't yet executed gclient
runhooks, running setup_links.py --clean-only will fail if
the Chromium checkout isn't yet synced. This can make bots
end up in a bad state since we now clean all links before running
bot_update. Relaxing this error solves that problem.

BUG=chromium:663278
TBR=ehmaldonado@webrtc.org
NOTRY=True

Committed: https://chromium.googlesource.com/external/webrtc/+/edec0769aacba3edfca02046b8dcebaa57efebf1

[kjellander_webrtc, 2016-11-15 21:37:52]

This should resolve errors like this
https://build.chromium.org/p/tryserver.webrtc/builders/win_compile_rel/builds...

[kjellander_webrtc, 2016-11-15 21:39:29]

Description was changed from

==========
Make setup_links.py not fail if Chromium checkout is missing.

If a checkout has been created but haven't yet executed gclient
runhooks, running setup_links.py --clean-only will fail if
the Chromium checkout isn't yet synced. This can make bots
end up in a bad state since we now clean all links before running
bot_update. Relaxing this error solves that problem.

BUG=chromium:663278
TBR=ehmaldonado@webrtc.org
NOTRY=True
==========

to

==========
Make setup_links.py not fail if Chromium checkout is missing.

If a checkout has been created but haven't yet executed gclient
runhooks, running setup_links.py --clean-only will fail if
the Chromium checkout isn't yet synced. This can make bots
end up in a bad state since we now clean all links before running
bot_update. Relaxing this error solves that problem.

BUG=chromium:663278
TBR=ehmaldonado@webrtc.org
NOTRY=True

Committed:
https://chromium.googlesource.com/external/webrtc/+/edec0769aacba3edfca02046b...
==========

[commit-bot: I haz the power, 2016-11-15 21:39:30]

Description was changed from

==========
Make setup_links.py not fail if Chromium checkout is missing.

If a checkout has been created but haven't yet executed gclient
runhooks, running setup_links.py --clean-only will fail if
the Chromium checkout isn't yet synced. This can make bots
end up in a bad state since we now clean all links before running
bot_update. Relaxing this error solves that problem.

BUG=chromium:663278
TBR=ehmaldonado@webrtc.org
NOTRY=True

Committed:
https://chromium.googlesource.com/external/webrtc/+/edec0769aacba3edfca02046b...
==========

to

==========
Make setup_links.py not fail if Chromium checkout is missing.

If a checkout has been created but haven't yet executed gclient
runhooks, running setup_links.py --clean-only will fail if
the Chromium checkout isn't yet synced. This can make bots
end up in a bad state since we now clean all links before running
bot_update. Relaxing this error solves that problem.

BUG=chromium:663278
TBR=ehmaldonado@webrtc.org
NOTRY=True

Committed: https://crrev.com/edec0769aacba3edfca02046b8dcebaa57efebf1
Cr-Commit-Position: refs/heads/master@{#15097}
==========

[kjellander_webrtc, 2016-11-15 21:39:30]

Committed patchset #1 (id:1) manually as
edec0769aacba3edfca02046b8dcebaa57efebf1 (presubmit successful).

[ehmaldonado_webrtc, 2016-11-16 09:01:46]

On 2016/11/15 21:39:30, kjellander_webrtc wrote:
> Committed patchset #1 (id:1) manually as
> edec0769aacba3edfca02046b8dcebaa57efebf1 (presubmit successful).

LGTM.