Merge remote-tracking branch 'origin/QA_4_6' into QA_4_6

ChangeLog

@@ -8,6 +8,7 @@ phpMyAdmin - ChangeLog
 - issue #12734 Fix PHP error when mbstring is not installed
 - issue #12736 Don't force partition count to be specified when creating a new table
 - issue #12759 Fix Notice regarding 'Undefined index: old_usergroup'
+- issue #12760 Fix Notice regarding 'Undefined index: users'
 
 4.6.5 (2016-11-24)
 - issue        Remove potentionally license problematic sRGB profile

libraries/server_privileges.lib.php

@@ -587,6 +587,10 @@ function PMA_getHtmlToChooseUserGroup($username)
 function PMA_setUserGroup($username, $userGroup)
 {
     $cfgRelation = PMA_getRelationsParam();
+    if (! isset($cfgRelation['users']) || isset($cfgRelation['usergroups'])) {
+        return;
+    }
+
     $userTable = Util::backquote($cfgRelation['db'])
         . "." . Util::backquote($cfgRelation['users']);