When I try to create a host with a DNS interface and en empty IP field, I get the following error:

Incorrect interface IP parameter "" provided. [hosts.php:479 ? CAPIObject->update() ? CAPIObject->__call() ? czbxrpc::call() ? czbxrpc::callAPI() ? call_user_func() ? CHost->update() ? CHostInterface->replaceHostInterfaces() ? CHostInterface->checkInput() ? CHostInterface->checkIp() ? CZBXAPI::exception() in /opt/lampp/htdocs/zabbix/trunk/frontends/php/api/classes/CHostInterface.php:645]

Regression, broken by:
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r36849 | eduards | 2013-07-10 10:33:49 +0300 (Wed, 10 Jul 2013) | 1 line

A......... ZBX-6361 fixed interface IP validation
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