AdminUI - Hide tabs for empty custom groups

Custom groups with no enabled fields should not appear
on the contact summary screen.

This looks to have recently regressed in core as well,
so I'm fixing it in both places.

CRM/Contact/Page/View/Summary.php

@@ -434,6 +434,10 @@ class CRM_Contact_Page_View_Summary extends CRM_Contact_Page_View {
     $activeGroups = CRM_Core_BAO_CustomGroup::getAll($filters, CRM_Core_Permission::VIEW);
 
     foreach ($activeGroups as $group) {
+      // Skip if custom group has no enabled fields
+      if (!count($group['fields'])) {
+        continue;
+      }
       $id = "custom_{$group['id']}";
       $allTabs[] = [
         'id' => $id,

ext/afform/core/Civi/Api4/Action/CustomGroup/GetAfforms.php

@@ -63,6 +63,14 @@ class GetAfforms extends \Civi\Api4\Generic\BasicBatchAction {
       ->execute()
       ->column('name');
 
+    // Custom group has no enabled fields; nothing to generate.
+    if (!$item['field_names']) {
+      return [
+        'id' => $item['id'],
+        'forms' => $forms,
+      ];
+    }
+
     // restrict forms other than block to if Admin UI is enabled
     $hasAdminUi = \CRM_Extension_System::singleton()->getMapper()->isActiveModule('civicrm_admin_ui');
     if (!$hasAdminUi) {