Better work around empty name for Zulip

backend/helpers/provision.py

@@ -231,7 +231,7 @@ class Provision:
         if app.slug == 'zulip':
             # Zulip does not accept an empty formatted name.
             if kratos_user.name is None or kratos_user.name == '':
-                data['name']['formatted'] = " "
+                data['name']['formatted'] = "name not set"
             # Zulip doesn't support SCIM user groups, but we can set the user
             # role as a field on the user object.
             if app_role.role_id == Role.ADMIN_ROLE_ID: