Hide/Show fields value in nodes
Create node--articles.html.twig and place it in your theme's templates folder.

{% if content.field_name.0 is empty %}
    &lt;div class="something"&gt;{{ content.field_name_other }}&lt;/div&gt;
{% else %}
    &lt;div class="something"&gt;{{ content.field_name }}&lt;/div&gt;
{% endif %}


Note: 


content.field_name.0 gets the raw value