Merged revisions 206868 via svnmerge from

https://origsvn.digium.com/svn/asterisk/trunk

................
  r206868 | dvossel | 2009-07-16 16:25:22 -0500 (Thu, 16 Jul 2009) | 14 lines
  
  Merged revisions 206867 via svnmerge from 
  https://origsvn.digium.com/svn/asterisk/branches/1.4
  
  ........
    r206867 | dvossel | 2009-07-16 16:24:16 -0500 (Thu, 16 Jul 2009) | 8 lines
    
    avoid segfault caused by user error
    
    If the CALLERPRES() dialplan function is set to nothing,
    a segfault occurs.  This is user error to begin with, but
    I'd rather see a cli warning message than have Asterisk
    crash on me.
  ........
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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.0@206871 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/callerid.c

@@ -1103,6 +1103,9 @@ static struct {
 int ast_parse_caller_presentation(const char *data)
 {
 	int i;
+	if (!data) {
+		return -1;
+	}
 
 	for (i = 0; i < ARRAY_LEN(pres_types); i++) {
 		if (!strcasecmp(pres_types[i].name, data))