Fix error on delete user who has express enties

[hissy]

This pull request fixes below error when deleting a user who is an owner of express entries.

Error message:

Doctrine\DBAL\Exception\ForeignKeyConstraintViolationException thrown with message "An exception occurred while executing 'DELETE FROM Users WHERE uID = ?' with params [4]:

SQLSTATE[23000]: Integrity constraint violation: 1451 Cannot delete or update a parent row: a foreign key constraint fails (`concrete5`.`expressentityentries`, CONSTRAINT `FK_B8AE3531FD71026C` FOREIGN KEY (`uID`) REFERENCES `Users` (`uID`))"

Stacktrace:
#42 Doctrine\DBAL\Exception\ForeignKeyConstraintViolationException in /path/to/concrete/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php:60
#41 Doctrine\DBAL\Driver\AbstractMySQLDriver:convertException in /path/to/concrete/vendor/doctrine/dbal/lib/Doctrine/DBAL/DBALException.php:128
#40 Doctrine\DBAL\DBALException:driverExceptionDuringQuery in /path/to/concrete/vendor/doctrine/dbal/lib/Doctrine/DBAL/Connection.php:1015
#39 Doctrine\DBAL\Driver\PDOException in /path/to/concrete/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php:107
#38 PDOException in /path/to/concrete/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php:105
#37 PDOStatement:execute in /path/to/concrete/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php:105
#36 Doctrine\DBAL\Driver\PDOStatement:execute in /path/to/concrete/vendor/doctrine/dbal/lib/Doctrine/DBAL/Connection.php:1006
#35 Doctrine\DBAL\Connection:executeUpdate in /path/to/concrete/vendor/doctrine/dbal/lib/Doctrine/DBAL/Connection.php:596
#34 Doctrine\DBAL\Connection:delete in /path/to/concrete/vendor/doctrine/orm/lib/Doctrine/ORM/Persisters/Entity/BasicEntityPersister.php:580
#33 Doctrine\ORM\Persisters\Entity\BasicEntityPersister:delete in /path/to/concrete/vendor/doctrine/orm/lib/Doctrine/ORM/UnitOfWork.php:1094
#32 Doctrine\ORM\UnitOfWork:executeDeletions in /path/to/concrete/vendor/doctrine/orm/lib/Doctrine/ORM/UnitOfWork.php:406
#31 Doctrine\ORM\UnitOfWork:commit in /path/to/concrete/vendor/doctrine/orm/lib/Doctrine/ORM/EntityManager.php:356
#30 Doctrine\ORM\EntityManager:flush in /path/to/concrete/src/User/UserInfo.php:280
#29 Concrete\Core\User\UserInfo:delete in /path/to/concrete/src/Workflow/Request/DeleteUserRequest.php:39
#28 Concrete\Core\Workflow\Request\DeleteUserRequest:approve in /path/to/concrete/src/Workflow/EmptyWorkflow.php:24
#27 Concrete\Core\Workflow\EmptyWorkflow:start in /path/to/concrete/src/Workflow/Progress/Progress.php:239
#26 Concrete\Core\Workflow\Progress\Progress:start in /path/to/concrete/src/Workflow/Request/UserRequest.php:68
#25 Concrete\Core\Workflow\Request\UserRequest:addWorkflowProgress in /path/to/concrete/src/Workflow/Request/Request.php:142
#24 Concrete\Core\Workflow\Request\Request:triggerRequest in /path/to/concrete/src/Workflow/Request/UserRequest.php:45
#23 Concrete\Core\Workflow\Request\UserRequest:trigger in /path/to/concrete/src/User/UserInfo.php:197
#22 Concrete\Core\User\UserInfo:triggerDelete in /path/to/concrete/controllers/single_page/dashboard/users/search.php:137
#21 Concrete\Controller\SinglePage\Dashboard\Users\Search:update_status in /path/to/concrete/src/Controller/AbstractController.php:294
#20 call_user_func_array in /path/to/concrete/src/Controller/AbstractController.php:294
#19 Concrete\Core\Controller\AbstractController:runAction in /path/to/concrete/src/Http/ResponseFactory.php:188
#18 Concrete\Core\Http\ResponseFactory:controller in /path/to/concrete/src/Http/ResponseFactory.php:362
#17 Concrete\Core\Http\ResponseFactory:collection in /path/to/concrete/src/Http/DefaultDispatcher.php:130
#16 Concrete\Core\Http\DefaultDispatcher:handleDispatch in /path/to/concrete/src/Http/DefaultDispatcher.php:58
#15 Concrete\Core\Http\DefaultDispatcher:dispatch in /path/to/concrete/src/Http/Middleware/DispatcherDelegate.php:39
#14 Concrete\Core\Http\Middleware\DispatcherDelegate:next in /path/to/concrete/src/Http/Middleware/ThumbnailMiddleware.php:76
#13 Concrete\Core\Http\Middleware\ThumbnailMiddleware:process in /path/to/concrete/src/Http/Middleware/MiddlewareDelegate.php:50
#12 Concrete\Core\Http\Middleware\MiddlewareDelegate:next in /path/to/concrete/src/Http/Middleware/FrameOptionsMiddleware.php:39
#11 Concrete\Core\Http\Middleware\FrameOptionsMiddleware:process in /path/to/concrete/src/Http/Middleware/MiddlewareDelegate.php:50
#10 Concrete\Core\Http\Middleware\MiddlewareDelegate:next in /path/to/concrete/src/Http/Middleware/CookieMiddleware.php:35
#9 Concrete\Core\Http\Middleware\CookieMiddleware:process in /path/to/concrete/src/Http/Middleware/MiddlewareDelegate.php:50
#8 Concrete\Core\Http\Middleware\MiddlewareDelegate:next in /path/to/concrete/src/Http/Middleware/ApplicationMiddleware.php:29
#7 Concrete\Core\Http\Middleware\ApplicationMiddleware:process in /path/to/concrete/src/Http/Middleware/MiddlewareDelegate.php:50
#6 Concrete\Core\Http\Middleware\MiddlewareDelegate:next in /path/to/concrete/src/Http/Middleware/MiddlewareStack.php:86
#5 Concrete\Core\Http\Middleware\MiddlewareStack:process in /path/to/concrete/src/Http/DefaultServer.php:85
#4 Concrete\Core\Http\DefaultServer:handleRequest in /path/to/concrete/src/Foundation/Runtime/Run/DefaultRunner.php:119
#3 Concrete\Core\Foundation\Runtime\Run\DefaultRunner:run in /path/to/concrete/src/Foundation/Runtime/DefaultRuntime.php:102
#2 Concrete\Core\Foundation\Runtime\DefaultRuntime:run in /path/to/concrete/dispatcher.php:36
#1 require in /path/to/index.php:3
#0 require in ~/.composer/vendor/laravel/valet/server.php:158

[hissy]

Originally reported by Pictron

https://concrete5-japan.org/community/forums/bug/post-18364/