ErrorException: Warning: Undefined array key "parent_id" in GroupGateway::getGroupLegacy

Sentry Issue: FOODSHARINGDE-BETA-BACKEND-1AW

ErrorException: Warning: Undefined array key "parent_id"
  File "/src/Modules/Group/GroupGateway.php", line 28, in Foodsharing\Modules\Group\GroupGateway::getGroupLegacy
    $out['workgroup_function'] = $this->groupFunctionGateway->getRegionGroupFunctionId($out['id'], $out['parent_id']);
  File "/src/Modules/Profile/ProfileController.php", line 271, in Foodsharing\Modules\Profile\ProfileController::getProfileMenu
    $arbitrationGroupDetails = $this->groupGateway->getGroupLegacy($arbitrationGroupId);
  File "/src/Modules/Profile/ProfileController.php", line 167, in Foodsharing\Modules\Profile\ProfileController::convertDataToObject
    'menu' => $this->getProfileMenu($userStores, $userArray, $maySeeStores),
  File "/src/Modules/Profile/ProfileController.php", line 77, in Foodsharing\Modules\Profile\ProfileController::index
    $params = $this->convertDataToObject($userStores, $userArray, $maySeeStores);
  File "/public/index.php", line 34
    $response = $kernel->handle($request);
...
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