Merged revisions 95024 via svnmerge from

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

........
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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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@95025 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/channel.c

@@ -4482,6 +4482,9 @@ ast_group_t ast_get_group(const char *s)
 	int start=0, finish=0, x;
 	ast_group_t group = 0;
 
+	if (ast_strlen_zero(s))
+		return 0;
+
 	c = ast_strdupa(s);
 	
 	while ((piece = strsep(&c, ","))) {