Redirect while error in form ZF2 - redirect

Question

I have a ZF2 form and validators.
I located at http://example.com/public/questions/edit/5730/2770,
where 5730 - $_GET['variant_id'], 2770 - $_GET['test_id'].
When I set input to empty value and submit form - I have an error, and ZF2 redirect me to http://example.com/public/questions/edit/5730 - without test_id (/2770).
How I can redirect me to a valid url? Thank all for answers.
Action:
public function editAction()
{
$language = 'EN';
$request = $this->getRequest();
$this->layout()->setVariable('messenger', 'Edit Questions');
$id = $this->params()->fromRoute('id');
$variantId = $this->params()->fromRoute('variant_id');
$sm = $this->getServiceLocator()->get('Zend\Db\Adapter\Adapter');
$stCategories = new CategoriesTable($sm);
$conFunc = new FunctionsController();
$form = new Form\AddQuestionsForm();
$stCVariants = new ContestVariantsTable($sm);
$stQuestions = new QuestionsTable($sm);
$categoryList = $stCategories->getCategories($language);
$categories = $conFunc->_getSubs(null, $categoryList);
$config = $this->getServiceLocator()->get('config');
$folder = $config['settings']['url'] . $config['settings']['media_files'];
if (empty($id) && !$request->isPost()) {
$this->redirect()->toRoute('stickynotes', array('controller' => 'stickynotes', 'action' => 'contests'));
} elseif ($request->isPost()) {
$form->setInputFilter($stQuestions->getAddQuestionsFilter());
$form->setData($request->getPost());
if ($form->isValid()) {
$arrPost = (array) $request->getPost();
$arrFile = (array) $request->getFiles();
$postData = array_merge_recursive($arrPost, $arrFile);
$tryAddQuestion = $stQuestions->updateQuestions($postData);
if ($tryAddQuestion['query'] && $tryAddQuestion['exception'] === null) {
$isUpload = new \Zend\Validator\File\UploadFile();
if ($isUpload->isValid($postData['filebutton'])) {
$path_parts = pathinfo($postData['filebutton']['name']);
$extension = '.' . $path_parts['extension'];
$filename = $tryAddQuestion['lastId'];
$config = $this->getServiceLocator()->get('config');
$folder = $config['settings']['media_files'];
if ($postData['AddQuestionMedia'] == 'image') {
$validator = new \Zend\Validator\File\IsImage();
$validator2 = new \Zend\Validator\File\Extension(array('png', 'jpeg', 'jpg', 'gif'));
if ($validator->isValid($postData['filebutton'])
&& $validator2->isValid($postData['filebutton'])) {
$filter = new \Zend\Filter\File\Rename($folder . 'images/' . $filename . $extension);
$filter->filter($postData['filebutton']);
chmod($config['settings']['media_files'] . 'images/' . $filename . $extension, 0644);
$stQuestions->updateQuestionsFile($filename, $extension);
}
} elseif ($postData['AddQuestionMedia'] == 'video') {
$validator = new \Zend\Validator\File\Extension(array('mp4'));
if ($validator->isValid($postData['filebutton'])) {
$filter = new \Zend\Filter\File\Rename($folder . 'videos/' . $filename . '.mp4');
$filter->filter($postData['filebutton']);
chmod($config['settings']['media_files'] . 'videos/' . $filename . '.mp4', 0644);
$stQuestions->updateQuestionsFile($filename, $extension);
}
} elseif ($postData['AddQuestionMedia'] == 'audio') {
$validator = new \Zend\Validator\File\Extension(array('mp3'));
if ($validator->isValid($postData['filebutton'])) {
$filter = new \Zend\Filter\File\Rename($folder . 'sounds/' . $filename . '.mp3');
$filter->filter($postData['filebutton']);
chmod($config['settings']['media_files'] . 'sounds/' . $filename . '.mp3', 0644);
$stQuestions->updateQuestionsFile($filename, $extension);
}
} else {
$this->layout()->setVariable('messenger_error', 'Uploaded file have incorrect format');
}
}
$this->layout()->setVariable('messenger_info', 'Question has been updated!');
$this->redirect()->toRoute('questions', array('controller' => 'questions', 'action' => 'edit',
'id' => $id, 'variant_id' => $postData['question_id']));
} elseif(!empty($tryAddContest['exception'])) {
$this->layout()->setVariable('messenger_error', 'Failed with DB while update question. Please try again. ' . $tryAddQuestion['exception']);
} else {
$this->layout()->setVariable('messenger_error', 'Failed while update question. Please try again.');
}
if (!empty($postData['variant_id'])) {
$stCVariants->addEntity($postData['variant_id'], $tryAddQuestion['lastId']);
}
}
} else {
if (!empty($variantId)) {
$getContest = $stCVariants->getSingleContest($variantId);
$progressions = array();
$used_progressions = $stCVariants->getUsedProgressions($id);
for ($i=$getContest['progression_start']; $i<=$getContest['progression_stop']; $i++) {
if (!in_array($i, $used_progressions))
$progressions[] = $i;
}
$form->remove('AddQuestionProgression');
$form->getInputFilter()->remove('AddQuestionProgression');
$select = new \Zend\Form\Element\Select('AddQuestionProgression');
$select->setValueOptions($progressions)->setAttributes(array(
'id' => 'progression_id',
'class' => 'form-control',
'style' => 'width: 408px;',
));
$form->get('variant_id')->setValue($id);
$form->add($select);
}
$getQuestion = $stQuestions->getSingleQuestion($id);
switch ($getQuestion['media_type']) {
case 'image':
$folder .= 'images/' . $getQuestion['media_content'];
break;
case 'video':
$folder .= 'videos/' . $getQuestion['media_content'];
break;
case 'audio':
$folder .= 'sounds/' . $getQuestion['media_content'];
break;
}
$form->get('variant_id')->setValue($id);
$form->get('question_id')->setValue($variantId);
}
return array(
'form' => $form,
'categories' => $categories,
'url' => $folder,
'id' => $id
);
}