Force user to mark custom taxonomy in Wordpress

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Staff would like to know if you have how to force the user to mark at least one custom taxonomy in Wordpress? Ex: In a post I have custom taxonomies, I would like to oblige the user when entering the post to mark at least one category.

wordpress

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This is a classic in WPSE: Force Category Choice before Creating new post?

It is necessary to adapt the post_type, add custom taxonomy in wp_dropdown_categories and use the function wp_set_object_terms to update this taxonomy.

I adapted using portfolio as Post Type and location as Custom Taxonomy. When we click on Add new, appears first a screen asking for the selection of a category, when selecting and submitting the new post is created with the custom category selected. The consideration is that this is only necessary when creating a new post, if it is to control the selections of existing posts it is necessary to inject jQuery for this. 

# Adapted from https://wordpress.stackexchange.com/questions/14403/force-category-choice-before-creating-new-post
add_filter( 'load-post-new.php', 'wpse14403_load_post_new' );
function wpse14403_load_post_new()
{
    $post_type = 'portfolio';
    if ( isset( $_REQUEST['post_type'] ) ) {
        $post_type = $_REQUEST['post_type'];
    }
    else
        return; // Se o post_type for 'post', o REQUEST vem vazio, precisa disto para não disparar nos posts

    // Only do this for posts
    if ( 'portfolio' != $post_type ) {
        return;
    }

    if ( array_key_exists( 'category_id', $_REQUEST ) ) {
        add_action( 'wp_insert_post', 'wpse14403_wp_insert_post' );
        return;
    }

    // Show intermediate screen
    extract( $GLOBALS );
    $post_type_object = get_post_type_object( $post_type );
    $title = $post_type_object->labels->add_new_item;

    include( ABSPATH . 'wp-admin/admin-header.php' );

    $dropdown = wp_dropdown_categories( array(
        'name' => 'category_id',
        'hide_empty' => false,
        'taxonomy' => 'location',
        'echo' => false,
    ) );

    $category_label = __( 'Category:' );
    $continue_label = __( 'Continue' );
    echo <<<HTML
<div class="wrap">
    <h2>{$title}</h2>

    <form method="get">
        <table class="form-table">
            <tbody>
                <tr valign="top">
                    <th scope="row">{$category_label}</th>
                    <td>{$dropdown}</td>
                </tr>
                <tr>
                    <td></td>
                    <th><input name="continue" type="submit" class="button-primary" value="{$continue_label}" /></th>
            </tbody>
        </table>
        <input type="hidden" name="post_type" value="{$post_type}" />
    </form>
</div>
HTML;
    include( ABSPATH . 'wp-admin/admin-footer.php' );
    exit();
}

// This function will only be called when creating an empty post,
// via `get_default_post_to_edit()`, called in post-new.php
function wpse14403_wp_insert_post( $post_id )
{
    wp_set_object_terms( $post_id, intval($_REQUEST['category_id']), 'location' );
}

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