[FIX] web: multi level grouped list: do not consider empty

Before this commit, when a list view was grouped by more than 1
field, the view was considered empty, and the no content helper
was displayed. For instance, go to Contacts and group by Company
and Country.

Part-of: odoo/odoo#133305

addons/web/static/src/model/relational_model/dynamic_group_list.js

@@ -36,9 +36,6 @@ export class DynamicGroupList extends DynamicList {
     }
 
     get hasData() {
-        if (this.count === 0) {
-            return false;
-        }
         return this.groups.some((group) => group.hasData);
     }
 

addons/web/static/src/model/relational_model/group.js

@@ -42,7 +42,7 @@ export class Group extends DataPoint {
     // -------------------------------------------------------------------------
 
     get hasData() {
-        return this.list.hasData;
+        return this.count > 0;
     }
     get isFolded() {
         return this.config.isFolded;

addons/web/static/tests/views/list_view_tests.js

@@ -2195,6 +2195,24 @@ QUnit.module("Views", (hooks) => {
         );
     });
 
+    QUnit.test("list view with multiple groupbys", async function (assert) {
+        await makeView({
+            type: "list",
+            resModel: "foo",
+            serverData,
+            arch: '<tree><field name="foo"/><field name="bar"/></tree>',
+            groupBy: ["bar", "foo"],
+            noContentHelp: "<p>should not be displayed</p>",
+        });
+
+        assert.containsNone(target, ".o_view_nocontent");
+        assert.containsN(target, ".o_group_has_content", 2);
+        assert.deepEqual(getNodesTextContent(target.querySelectorAll(".o_group_has_content")), [
+            "No (1) ",
+            "Yes (3) ",
+        ]);
+    });
+
     QUnit.test("deletion of record is disabled when groupby m2m field", async function (assert) {
         serviceRegistry.add(
             "user",