Set 'required' to false for Email field in UserGroupType form.

Changed the Email field's 'required' option to false, allowing it to be optional. This adjustment aims to improve the usability and flexibility of the UserGroupType form.

src/Bundle/ChillMainBundle/Form/UserGroupType.php

@@ -39,6 +39,7 @@ class UserGroupType extends AbstractType
                 'label' => 'user_group.Email',
                 'help' => 'user_group.EmailHelp',
                 'empty_data' => '',
+                'required' => false,
             ])
             ->add('excludeKey', TextType::class, [
                 'label' => 'user_group.ExcludeKey',