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typos: fix typos in several locations stable
Mon, 04 Dec 2017 14:27:27 -0800, by Kyle Lippincott
topic: use more protective code to access current topic stable
Tue, 05 Dec 2017 13:53:04 +0100, by Pierre-Yves David
topic: use more protective code to access publishing code stable
Tue, 05 Dec 2017 13:21:57 +0100, by Pierre-Yves David

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