Undefined index in HostGroup API if trying to update hostgroup without groupid.

Notice: Undefined index: groupid in /home/zabbix/www/trunk/frontends/php/api/classes/CHostGroup.php on line 518

{
"jsonrpc": "2.0",
"method": "hostgroup.update",
"params":

,
"id": 0,
"auth": "5a3d801e3e54a43853b5b986e2097442"
}

Same issue can be found in other API classes..

NOTE: This task must use new method checkObjectId() which is implemented in ZBXNEXT-1633