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Committer:
Asif Saifuddin Auvi
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Author(s):
gord chung
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Date:
2017-04-13 12:20:07 UTC
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Revision ID:
git-v1:b66bdcbff98047819359b64648f6ba3f7e2cdcd0
don't fail if collect already called (#128)
avoid AttributeError if collect is called and no channels exist.
can occur if collect called twice.