allow empty servers (Fixes: #3874)

Florian Schaal

2016-05-04 cc08f2c13f7155d6f3fb11afa7661aaec676858a

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<?php
$wb['list_head_txt'] = 'Additional PHP Versions';
$wb['server_id_txt'] = 'Server';
$wb['add_new_record_txt'] = 'Add new PHP version';
$wb['client_id_txt'] = 'Client';
$wb['name_txt'] = 'PHP Name';
?>