See the details here
if (this.getValue() === '') {
jQuery('#your_repeat_table___element_to_hide_' + this.getRepeatNum()).closest('.fabrikElement').hide()
}
var vpochecklist = Fabrik.getBlock('form_6').formElements.get('bw_projects___po_checklist');
var vid = Fabrik.getBlock('form_6').formElements.get('bw_projects___id');
vidvalue = vid.get('value');
if (vidvalue === '') {
vpochecklist.hide();
}
else {
vpochecklist.show();
}