fix(helpdesk): fix contact name resolution when customerNo is empty

getContactsForCustomerWithMeta() returned early when customerNo OR
customerName was empty. The communication service calls it with empty
customerNo and only customerName — which always hit the early return,
preventing any contact lookup. Fix: only return early when BOTH are
empty, so the primary Company_Name query path works correctly.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

modules/helpdesk/lib/Module/Helpdesk/Service/BcODataGateway.php

@@ -224,7 +224,7 @@ class BcODataGateway
     {
         $customerNo = trim($customerNo);
         $customerName = trim($customerName);
-        if ($customerNo === '' || $customerName === '') {
+        if ($customerNo === '' && $customerName === '') {
             return [
                 'contacts' => [],
                 'meta' => [