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  • You should use get_sub_field() to get the value into a variable, this way:

    <?php
    $style = "";
    $code_snippet = get_sub_field('code-snippet');
    if(empty($code_snippet)){
       $style = 'style="display:none;"';
    }
    ?>
    <div class="content-code" <?php echo $style;?>>
        <article>
            <pre>
                 <?php echo $code_snippet; ?>
           </pre>
        </article>
    </div>