added a condition for 'add new' button to only display when you edit an entity and no longer display on the create form

Resources/views/CRUD/base_edit.html.twig

@@ -28,7 +28,7 @@ file that was distributed with this source code.
             {% if admin.hasroute('history') and admin.id(object) and admin.isGranted('EDIT', object) %}
                 <li class="btn sonata-action-element"><a href="{{ admin.generateObjectUrl('history', object) }}">{% trans from 'SonataAdminBundle' %}link_action_history{% endtrans %}</a></li>
             {% endif %}
-            {% if admin.hasroute('create') and admin.isGranted('CREATE')%}
+            {% if admin.hasroute('create') and admin.isGranted('CREATE') and admin.id(object)%}
                 <li class="btn sonata-action-element"><a href="{{ admin.generateUrl('create') }}">{% trans from 'SonataAdminBundle' %}link_action_create{% endtrans %}</a></li>
             {% endif %}
             {% if admin.hasroute('list') and admin.isGranted('LIST')%}