Merged revisions 246030 via svnmerge from

Merged revisions 246030 via svnmerge from
https://origsvn.digium.com/svn/asterisk/trunk

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  r246030 | tilghman | 2010-02-10 10:01:28 -0600 (Wed, 10 Feb 2010) | 12 lines

  Solaris doesn't like outputting a NULL to a %s in format strings.

  Detect all platforms that don't like that, either, and ensure that when documentation is
  missing, we pass a non-NULL pointer when outputting the corresponding documentation.

  (closes issue #16689)
   Reported by: bklang
   Patches:
         20100209__issue16689__with_tests.diff.txt uploaded by tilghman (license 14)

  Review: https://reviewboard.asterisk.org/r/497/
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