Referring to In-Link in ItemCount method of CategoriesEventHandler class

As you can see below we are referring to In-Link prefix below which is
unacceptable. I came across this issue when there was NO In-Link
installed.

function ItemCount($params)

{ $object =& $this->getObject($params); $ci_table = $this->Application->getUnitOption('l-ci', 'TableName'); $sql = 'SELECT COUNT(*) FROM ' . $object->TableName . ' c LEFT JOIN ' . $ci_table . ' ci ON c.CategoryId = ci.CategoryId WHERE (c.TreeLeft BETWEEN ' . $object->GetDBField('TreeLeft') . ' AND ' . $object->GetDBField('TreeRight') . ') AND NOT (ci.CategoryId IS NULL)'; return $this->Conn->GetOne($sql); }