Codes for record not found?

[eluser]solid9[/eluser]
Hi guys

I have these codes below,

controller:

Code:

function edit_show_r()
{
    //capture product data
    //fetch record where product is the index
    if(isset($_POST['Edit'])) {  
$product = $this->input->post('product');
$data['rows'] = $this->rmodel->show_record_prod($product);
        $this->load->view('ahe_page2', $data);
    }
}

model:

Code:

function show_record_prod($product) {
   $this->db->select('prod_name, phase');
   $this->db->from('products');
   $this->db->where('prod_name', $product);
  
   $q = $this->db->get();
  
   if($q->num_rows() > 0) {
      foreach ($q->result() as $row) {
        $data[] = $row;
      }
      return $data;
   }
   else
   {
   //If record not found do something here.
  
   }
}

This is just a simple query in the model.
Now in the model what is the right codes if the record is not found?
Or did not matched?

Thanks in advanced.