[TASK] Fix PHPStan validation

Author: IchHabRecht

Classes/Controller/ModuleController.php

@@ -94,7 +94,9 @@ public function listAction(): ResponseInterface
         $formUids = $this->mailRepository->findGroupedFormUidsToGivenPageUid((int)$this->id);
         $mails = $this->mailRepository->findAllInPid((int)$this->id, $this->settings, $this->piVars);
 
-        $currentPage = (int)($this->request->getParsedBody()['currentPage'] ?? $this->request->getQueryParams()['currentPage'] ?? 1);
+        $parsedBody = $this->request->getParsedBody() ?? [];
+        assert(is_array($parsedBody));
+        $currentPage = (int)($parsedBody['currentPage'] ?? $this->request->getQueryParams()['currentPage'] ?? 1);
         $currentPage = $currentPage > 0 ? $currentPage : 1;
 
         $itemsPerPage = (int)($this->settings['perPage'] ?? 10);