windows build tweaks.

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@9922 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/applications/mod_commands/mod_commands.c

@@ -2335,7 +2335,7 @@ SWITCH_STANDARD_API(uuid_session_heartbeat_function)
 
 	argc = switch_separate_string(mycmd, ' ', argv, (sizeof(argv) / sizeof(argv[0])));
 
-	if (argc != 2) {
+	if (argc != 2 || !argv[0]) {
 		goto error;
 	}