Merged revisions 261274 via svnmerge from

Merged revisions 261274 via svnmerge from
https://origsvn.digium.com/svn/asterisk/branches/1.4

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  r261274 | pabelanger | 2010-05-05 12:42:22 -0400 (Wed, 05 May 2010) | 12 lines

  Registration fix for SIP realtime.

  Make sure realtime fields are not empty.

  (closes issue #17266)
  Reported by: Nick_Lewis
  Patches:
        chan_sip.c-realtime.patch uploaded by Nick Lewis (license 657)
  Tested by: Nick_Lewis, sberney

  Review: https://reviewboard.asterisk.org/r/643/
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@261314 65c4cc65-6c06-0410-ace0-fbb531ad65f3