I'm work on generation PDF from TCPDF in my current wp project, i have value:

$v4 = unserialize(get_post_meta(get_post_meta($dog_id, 'nd_prod', true), 'np_str_ot_summ', true))[0];

in my TCPD i use this as output data:

<td style="text-align:center; font-size:9px; line-height=8px">
                '.str_replace("." , "," , $v4).'
</td>

and in principle all good, but i need add condition: if not data, add text: No records, how i can do this?

Upd.

try add:

if(isset($v41)){
         $v41 = str_replace("." , "," , $v4);
         }else{
         $v41 = 'No records';    
        }

outputted only No records - but records - present