How to add blank value in a TCA select list

In some cases, during the development of an extension, it is required to add a blank value in a select list. In order to add the empty value it is required to add the following lines of code in TCA.php file:

'items' => array(
 array('', 0),
 ),

Example:

'next' => array( 
'exclude' => 1,
'label' => 'LLL:EXT:yourExt/Resources/Private/Language/locallang_db.xlf:tx_your_ext.next', 
'config' => array(
'type' => 'select', 
'items' => array(
 array('', 0),
 ), 
'foreign_table' => 'tx_your_ext_table',
'minitems' => 0,
'maxitems' => 1,
 ),
),