Error when csv file to upload is not specified

[Tobias-Horstmann]

version 0.4.55

When uploading a new bank statement and you have forgotten to specify the bank account you get following error:

An error occurred during execution; please try again later.
Additional information:
Exception

File:

/home/ejc2016/www/ejc2016.ers.inbaz.org/module/Admin/src/Admin/Controller/BankaccountController.php:344

Message:

Unable to open csv

Stack trace:

#0 /home/ejc2016/www/ejc2016.ers.inbaz.org/vendor/zendframework/zend-mvc/src/Controller/AbstractActionController.php(82): Admin\Controller\BankaccountController->uploadCsvAction()
#1 [internal function]: Zend\Mvc\Controller\AbstractActionController->onDispatch(Object(Zend\Mvc\MvcEvent))
#2 /home/ejc2016/www/ejc2016.ers.inbaz.org/vendor/zendframework/zend-eventmanager/src/EventManager.php(444): call_user_func(Array, Object(Zend\Mvc\MvcEvent))
#3 /home/ejc2016/www/ejc2016.ers.inbaz.org/vendor/zendframework/zend-eventmanager/src/EventManager.php(205): Zend\EventManager\EventManager->triggerListeners('dispatch', Object(Zend\Mvc\MvcEvent), Object(Closure))
#4 /home/ejc2016/www/ejc2016.ers.inbaz.org/vendor/zendframework/zend-mvc/src/Controller/AbstractController.php(118): Zend\EventManager\EventManager->trigger('dispatch', Object(Zend\Mvc\MvcEvent), Object(Closure))
#5 /home/ejc2016/www/ejc2016.ers.inbaz.org/vendor/zendframework/zend-mvc/src/DispatchListener.php(93): Zend\Mvc\Controller\AbstractController->dispatch(Object(Zend\Http\PhpEnvironment\Request), Object(Zend\Http\PhpEnvironment\Response))
#6 [internal function]: Zend\Mvc\DispatchListener->onDispatch(Object(Zend\Mvc\MvcEvent))
#7 /home/ejc2016/www/ejc2016.ers.inbaz.org/vendor/zendframework/zend-eventmanager/src/EventManager.php(444): call_user_func(Array, Object(Zend\Mvc\MvcEvent))
#8 /home/ejc2016/www/ejc2016.ers.inbaz.org/vendor/zendframework/zend-eventmanager/src/EventManager.php(205): Zend\EventManager\EventManager->triggerListeners('dispatch', Object(Zend\Mvc\MvcEvent), Object(Closure))
#9 /home/ejc2016/www/ejc2016.ers.inbaz.org/vendor/zendframework/zend-mvc/src/Application.php(314): Zend\EventManager\EventManager->trigger('dispatch', Object(Zend\Mvc\MvcEvent), Object(Closure))
#10 /home/ejc2016/www/ejc2016.ers.inbaz.org/public/index.php(18): Zend\Mvc\Application->run()
#11 {main}

expected behavior:
check if it is specified and if not give an error message saying "please specify bank account"

[BigAndini]

-> check if csv file is specified and create a nice error message