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Aneesh Agrawal ea618b9163 servo: Merge #16639 - Avoid searching for old nightlies in missing dirs (from aneeshusa:skip-nonexisting-dirs-when-cleaning-nightlies); r=jdm

These directories may be missing (e.g. a first time build or due to Buildbot cleaning),
so don't try to look inside them for old nightlies if so.

I noticed this in http://build.servo.org/builders/arm32/builds/6815/steps/shell__1/logs/stdio.

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Source-Repo: https://github.com/servo/servo
Source-Revision: 5c321737c65c1c7f11b9c58d010e07412403167a

2017-04-27 17:18:55 -05:00