[Buildbot] #3207: BufferLogObserver doesn't preserve unicode'ness

[Buildbot trac]

#3207: BufferLogObserver doesn't preserve unicode'ness
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Reporter:  vlovich    |      Owner:
    Type:  undecided  |     Status:  new
Priority:  major      |  Milestone:  undecided
 Version:  0.8.10     |   Keywords:
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 When it has multiple chunks, it does ''.join(chunks) instead of
 u''.join(chunks) which is what it does in all the other conditions.

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Ticket URL: <http://trac.buildbot.net/ticket/3207>
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