[FIX] web, x2ManyField: allowed to not have an arch set

In which case we just don't render any Renderer.
Useful when we want to render invisible fields.

X-original-commit: e77afa6266a66e9d126d9a0293bb3e0eb8fb0ff3
Part-of: odoo/odoo#102153

addons/web/static/src/views/fields/field.js

@@ -275,7 +275,7 @@ Field.parseFieldNode = function (node, models, modelName, viewType, jsClass) {
                 viewMode = "list";
             } else if (!views.list && views.kanban) {
                 viewMode = "kanban";
-            } else {
+            } else if (views.list && views.kanban) {
                 viewMode = "list,kanban";
             }
         } else {

addons/web/static/src/views/fields/x2many/x2many_field.js

@@ -35,7 +35,12 @@ export class X2ManyField extends Component {
             this.isMany2Many
         );
 
-        const archInfo = this.activeField.views[this.viewMode];
+        let archInfo;
+        if (this.viewMode) {
+            archInfo = this.activeField.views[this.viewMode];
+        } else {
+            archInfo = {};
+        }
         const subViewActiveActions = archInfo.activeActions;
         this.activeActions = useActiveActions({
             crudOptions: Object.assign({}, this.activeField.options, {

addons/web/static/src/views/fields/x2many/x2many_field.xml

@@ -18,7 +18,7 @@
                 </div>
             </div>
             <ListRenderer t-if="viewMode === 'list'" t-props="rendererProps" />
-            <KanbanRenderer t-else="" t-props="rendererProps" />
+            <KanbanRenderer t-elif="viewMode" t-props="rendererProps" />
         </div>
     </t>