Fix Swagger UI integration

Author: dunglas

src/Bridge/Symfony/Bundle/Resources/views/SwaggerUi/index.html.twig

@@ -47,7 +47,7 @@
                         }
                     });
 
-                    {% if operationId is defined %}
+                    {% if operationId is not null %}
                         {% set domId = '#' ~ shortName ~ '_' ~ operationId %}
                         {% set id = app.request.attributes.get('id') %}
 
@@ -72,7 +72,7 @@
                 onFailure: function() {
                     log('Unable to Load SwaggerUI');
                 },
-                docExpansion: {% if operationId is defined %}'none'{% else %}'list'{% endif %},
+                docExpansion: 'list',
                 jsonEditor: false,
                 defaultModelRendering: 'schema',
                 showRequestHeaders: true