PrefixSpecial for ListSortings config option not set in SetSorting method of kDBEventHandler class

The problem showed itself when you tried specifying PrefixSpecial with empty values, for example 'search' as below:

'ListSortings' => Array(
'' => Array(
'ForcedSorting' => Array("CurrentSort" => 'asc', 'Priority' =>
'desc', 'Name' => 'asc'),
'Sorting' => Array('Name' => 'asc'),
),
'search' => Array(),
),

In result 'search' wouldn't be selected.