Show out of stock options on shop page

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By default plugin hides out of stock options in case where no variation linked to that option exists. Optionally you can show them by using below given code snippet.

add_action('wcva_shop_outofstock_output','wcva_shop_outofstock_output_function',10,2);
function wcva_shop_outofstock_output_function($filtered_array,$all_values) {
    return $all_values;
    
}