via tony

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@6118 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/switch_core_session.c

@@ -905,8 +905,8 @@ SWITCH_DECLARE(switch_status_t) switch_core_session_exec(switch_core_session_t *
 	switch_event_t *event;
 	switch_channel_t *channel;
 
-	if (switch_strlen_zero(arg)) {
-		arg = "_undef_";
+	if (!arg) {
+		arg = "";
 	}
 
 	log = switch_core_session_alloc(session, sizeof(*log));