empty states

pages/admin/tenants/_form.phtml

@@ -265,7 +265,19 @@ $openOverrideCard = $detailsOpenAll;
     <?php if ($showCustomFieldsTab): ?>
       <div data-tab-panel="custom_fields">
         <?php if ($customFieldTenantUuid === ''): ?>
-          <p class="muted"><?php e(t('Save tenant first to manage custom fields')); ?></p>
+          <?php
+          $emptyState = [
+            'message' => t('Save tenant first to manage custom fields'),
+            'size' => 'compact',
+          ];
+          if (!$isReadOnly) {
+            $emptyState['action'] = [
+              'label' => t('Create'),
+              'form' => $formId,
+            ];
+          }
+          require templatePath('partials/app-empty-state.phtml');
+          ?>
         <?php else: ?>
           <blockquote data-variant="info">
             <?php e(t('Define custom fields here. They appear per user in the "Custom fields" tab and can be maintained there.')); ?>