Merged revisions 290713 via svnmerge from

Merged revisions 290713 via svnmerge from
https://origsvn.digium.com/svn/asterisk/branches/1.8

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  r290713 | russell | 2010-10-07 13:00:52 +0200 (Thu, 07 Oct 2010) | 11 lines

  Merged revisions 290712 via svnmerge from
  https://origsvn.digium.com/svn/asterisk/branches/1.6.2

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    r290712 | russell | 2010-10-07 12:53:56 +0200 (Thu, 07 Oct 2010) | 4 lines

    Don't crash when Set() is called without a value.

    Review: https://reviewboard.asterisk.org/r/949/
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@290714 65c4cc65-6c06-0410-ace0-fbb531ad65f3