debug zimbra access

zimbraSingle.inc

@@ -26,7 +26,7 @@ function zimbraSingleGetAccess()
     $accessData = array('zimbraServer' => '', 'adminUser' => '', 'adminPass' => '');
     $whmcs = App::self();
     $serverGroupID = $whmcs->get_req_var('servergroup');
-    if($serverGroupID) {
+    if($serverGroupID != '') {
 
         logModuleCall(
             'zimbrasingle',