Merged revisions 311352 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.8

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  r311352 | jrose | 2011-03-18 11:19:05 -0500 (Fri, 18 Mar 2011) | 10 lines
  
  Changes some print statements/events to use a blank string in place of NULL if the string in question is NULL.
  
  This is supposed to improve Solaris compatibility since Solaris goes berserk when trying to output NULL strings.
  
  (closes issue #18759)
  Reported by: bklang
  Patches:
        null-strings.patch uploaded by bklang (license 919)
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@311373 65c4cc65-6c06-0410-ace0-fbb531ad65f3