{if segment_2 != ""}
    {if "movies|books|music" *= segment_2}
        {!-- all is well (there is no "does not contain" directive in EE) --}
    {if:else}
        {!--redirect="404"--}

        {!-- TEMPORARY WORKAROUND--}
        {exp:channel:entries
            channel="resources"
            url_title="does_not_exist"
            disable="categories|category_fields|custom_fields|member_data|pagination"}
                {if no_results } {redirect="404"} {/if}
        {/exp:channel:entries}
    {/if}
{/if}

{if {exp:stash:is_empty name="current_category_name"}}
    <?php
        $this->EE->output->set_header("HTTP/1.0 404 Not Found");
    ?>
    {!--redirect="404"--}
    {redirect="error/error-404"}
{/if}