Aliases: Crash report is generated when trying to delete an alias which is in use by a filter rule

[mlht]

• [x] I have read the contributing guide lines at https://github.com/opnsense/core/blob/master/CONTRIBUTING.md
• [x] I am convinced that my issue is new after having checked both open and closed issues at https://github.com/opnsense/core/issues?q=is%3Aissue

Describe the bug OPNsense 22.7.6 Deleting an alias which is in use by a filter rule is not allowed. This is correct. But a crash report with php errors is generated:

[18-Oct-2022 19:27:17 Europe/Berlin] OPNsense\Base\UserException: Cannot delete alias. Currently in use by [filter.rule.0/source.address] Test in /usr/local/opnsense/mvc/app/controllers/OPNsense/Firewall/Api/AliasController.php:160 Stack trace:

0 [internal function]: OPNsense\Firewall\Api\AliasController->delItemAction('da063796-b7be-4...')

1 [internal function]: Phalcon\Dispatcher\AbstractDispatcher->callActionMethod(Object(OPNsense\Firewall\Api\AliasController), 'delItemAction', Array)

2 [internal function]: Phalcon\Dispatcher\AbstractDispatcher->dispatch()

3 /usr/local/opnsense/www/api.php(24): Phalcon\Mvc\Application->handle('/api/firewall/a...')

4 {main}

(Haven't seen this before version 22.7)

[AdSchellevis]

looks like a side affect indeed, UserExceptions should only appear on screen. @mlht Thanks for reporting!