[MTOS-dev] SubRoutine logout() for MT 3.35

[小咔]

sub logout {
    my $app = shift;
    if (my $user = $app->user) {
        $app->log($app->translate("User '[_1]' (ID:[_2]) logged out",
                                  $user->name, $user->id));
        $user->remove_sessions;
        delete $app->{author};
    }
    $app->clear_login_cookie;
    $app->build_page('login.tmpl', {logged_out => 1, no_breadcrumbs => 1});
}


scalar $user an undefined value,Why? ...
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