fix: Fix deactivated enterprise user when no plan activated users

Author: suejung-sentry

graphql_api/types/query/query.py

@@ -51,9 +51,9 @@ async def resolve_owner(
     if settings.IS_ENTERPRISE and settings.GUEST_ACCESS is False:
         if not user or not user.is_authenticated:
             raise UnauthorizedGuestAccess()
-
-        target = await get_owner(service, username)
-        if user.ownerid not in target.plan_activated_users:
+        target_owner = await get_owner(service, username)
+        has_plan_activated_users = target_owner and target_owner.plan_activated_users is not None
+        if has_plan_activated_users and user.ownerid not in target_owner.plan_activated_users:
             raise UnauthorizedGuestAccess()
 
     return await get_owner(service, username)