Steps to reproduce:

1. Inject \Ibexa\Contracts\CorporateAccount\Service\CompanyService
2. Try loading non-Company Content item, e.g.

$company = $this->companyService->getCompany(1);
var_dump($company->getBillingAddress());

Actual result:
An error occurs
Return value of Ibexa\Contracts\CorporateAccount\Values\Company::getBillingAddress() must be an instance of Ibexa\FieldTypeAddress\FieldType\Value, null returned

Expected result
$this->companyService->getCompany(1) throws Repository PAPI NotFound Exception