Merged revisions 95024 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

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r95024 | russell | 2007-12-27 15:40:02 -0600 (Thu, 27 Dec 2007) | 9 lines

Don't report a syntax error when an empty string is passed to ast_get_group.
Just return 0.

(closes issue #11540)
Reported by: tzafrir
Patches: 
      group_empty.diff uploaded by tzafrir (license 46)
	   -- slightly changed by me

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