TYPO3.Flow

If I excecute the following code in FLOW3 a F3::PHPCR::NodeType::NoSuchNodeTypeException is thrown:

$taskManagement1 = $this->objectFactory->create('F3::TaskManagement::Domain::TaskManagement');
$taskManagement1->setName('TheTaskManagement');
$this->taskManagementRepository->add($taskManagement1);

Then I tried to catch the Exception which is thrown and throw a status.

try {
$taskManagement1 = $this->objectFactory->create('F3::TaskManagement::Domain::TaskManagement');
$taskManagement1->setName('TheTaskManagement');
$this->taskManagementRepository->add($taskManagement1);
} catch(F3::PHPCR::NodeType::NoSuchNodeTypeException $e) {
$this->throwStatus(500);
}

Result: This does not work and no "500 Internal Server Error" is shown. Only the Exception itself.

After that I added the throwStatus(500) outside the catch-block to check if that works.
Result:The Status "500 Internal Server Error" is shown but also the exception appears.
Is this the correct behavier, that the exception is still shown after throwing the status?