Problems with <br/> when textarea empty !

writer.setRules( 'br',
    {
        // Indicates that this tag causes indentation on line breaks inside of it.
        indent : false,

        // Insert a line break before the <p> tag.
        breakBeforeOpen : false,

        // Insert a line break after the <p> tag.
        breakAfterOpen : false,

        // Insert a line break before the </p> closing tag.
        breakBeforeClose : false,

        // Insert a line break after the </p> closing tag.
        breakAfterClose : false
    });