Départements et emplacements

$tax_query = array(
	'relation' => 'OR',
	array(
		'taxonomy'         => 'emplacement',
		'terms'            => array( '55', '' ),
		'field'            => 'term_id',
		'operator'         => 'IN',
	),
	array(
		'taxonomy'         => 'departement',
		'terms'            => array( '54', '' ),
		'field'            => 'term_id',
		'operator'         => 'IN',
	),
);