Merged revisions 228015 via svnmerge from

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

........
  r228015 | tilghman | 2009-11-05 11:08:02 -0600 (Thu, 05 Nov 2009) | 4 lines
  
  Don't crash if no arguments are passed.
  (closes issue #16119)
   Reported by: thedavidfactor
........


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.1@228016 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_externalivr.c

@@ -349,6 +349,11 @@ static int app_exec(struct ast_channel *chan, void *data)
 	u->abort_current_sound = 0;
 	u->chan = chan;
 
+	if (ast_strlen_zero(data)) {
+		ast_log(LOG_WARNING, "ExternalIVR requires a command to execute\n");
+		return -1;
+	}
+
 	buf = ast_strdupa(data);
 	AST_STANDARD_APP_ARGS(eivr_args, buf);