find with null

Anyone knows why the following does not produce valid SQL syntax and
how to go get the right result?

$TitleArray = array('a', 'b', 'c');
$result = $this->Post->find('all',array(
'recursive'=>-1,
'conditions' => array(
'OR'=> array('title'=>null, 'title'=>$TitleArray)
),
));

I want null or value in range

but null is ingnored and I get only IN (a, b, c)

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