When any provision of this code expressly authorizes or requires the governing board of a community college district to grant a leave of absence for any purpose or for any period of time to persons employed in classified positions, that express authorization or requirement shall not deprive the governing board of the power to grant leaves of absence with or without pay to those employees for other purposes or for other periods of time, so long as the governing board does not deprive any employee of any leave of absence to which he or she is entitled by law.