Merged revisions 62171 via svnmerge from

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

........
r62171 | russell | 2007-04-27 11:14:11 -0500 (Fri, 27 Apr 2007) | 6 lines

If no variables were passed into pbx_substitute_variables_helper_full(), then
don't even bother creating a temporary bogus channel, since that is only for
allowing certain functions to operate on the variables as if they were on a 
channel.  Most importantly, this fixes a crash.
(issue #9613, reported by callguy, fixed by me)

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@62172 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/pbx.c

@@ -1564,7 +1564,7 @@ static void pbx_substitute_variables_helper_full(struct ast_channel *c, struct v
 			parse_variable_name(vars, &offset, &offset2, &isfunction);
 			if (isfunction) {
 				/* Evaluate function */
-				if (c)
+				if (c || !headp)
 					cp4 = ast_func_read(c, vars, workspace, VAR_BUF_SIZE) ? NULL : workspace;
 				else {
 					struct varshead old;