webservice MDL-23536 fix missing test when no missing capability

admin/webservice/service_users.php

@@ -97,7 +97,7 @@ $usersmissingcaps = $webservicemanager->get_missing_capabilities_by_users($allow
 
 //add the missing capabilities to the allowed users object to be displayed by renderer
 foreach ($allowedusers as &$alloweduser) {
-    if (!is_siteadmin($alloweduser->id)) {
+    if (!is_siteadmin($alloweduser->id) and key_exists($alloweduser->id, $usersmissingcaps)) {
         $alloweduser->missingcapabilities = implode(',', $usersmissingcaps[$alloweduser->id]);
     }
 }

lib/adminlib.php

@@ -6980,7 +6980,8 @@ class admin_setting_managewebservicetokens extends admin_setting {
                 $usermissingcaps = $webservicemanager->get_missing_capabilities_by_users(
                         array(array('id' => $token->userid)), $token->serviceid);
 
-                if (!is_siteadmin($token->userid)) {
+                if (!is_siteadmin($token->userid) and
+                        key_exists($token->userid, $usermissingcaps)) {
                     $missingcapabilities = implode(',',
                             $usermissingcaps[$token->userid]);
                     if (!empty($missingcapabilities)) {