Why my empty array still inserts into the my db table?

[eluser]xeroblast[/eluser]
try:

Code:

if ($this->input->post('report_no')) $data['report_no']=$this->input->post('report_no');
if ($this->input->post('reporting_unit')) $data['reporting_unit']=$this->input->post('reporting_unit');
if ($offense) $data['offenses_committed']=$offense;