WSOD - User with delegates can't be removed - missing meaningful error message in UI

[AlfredSK]

• [X ] I have searched open and closed issues for duplicates

Bug Description

When an administrator/moderator is trying to delete a user account with delegates the account deletion fails with a WSOD - HTTP error 500. There is no meaningful info/popup message why this account couldn't be removed.

In my case the account has been blocked some time ago. Now I want to delete it. But I'm not sure if the blocked state of the account has any impact on the behavior/error.

In Friendica's application log this message appears when the WSOD happens:

Uncaught Exception RuntimeException: "User with delegates can't be removed, please remove delegate users first" at .../src/Model/User.php line 1770 
{"exception":"RuntimeException: User with delegates can't be removed, please remove delegate users first in .../src/Model/User.php:1770
Stack trace:
#0 .../src/Module/Moderation/Users/Blocked.php(81): Friendica\\Model\\User::remove()
#1 .../src/BaseModule.php(250): Friendica\\Module\\Moderation\\Users\\Blocked->content()
#2 .../src/App.php(714): Friendica\\BaseModule->run()
#3 .../index.php(55): Friendica\\App->runFrontend()
#4 {main}"} - 
{"file":null,"line":null,"function":null,"request-id":"663b4e324c109","stack":"ErrorHandler::handleException (128), ErrorHandler::Friendica\\Core\\Logger\\Handler\\{closure}","uid":"809aa8","process_id":90405}

Steps to Reproduce

1. find an account with delegates
2. try to delete that account
3. exception error with WSOD

Actual Result:
WSOD

Expected Result:
No WSOD, but a proper error page or go back to the previous page (in my case for example (https://libranet.de/moderation/users/blocked?o=last-activity) and show a popup/info-bubble with an meaningful message why the account couldn't be removed.

Platform Info

Friendica Version:
2024.06-dev

Friendica Source:
git

PHP version:
8.1

SQL version:
MariaDB 10.6

[MrPetovan]

This exception was introduced to prevent regular accounts to self-delete and lose access to their delegated accounts. It looks like we need to carve an exception for admin deletion.