Merge pull request #14299 from atm-gauthier/9.0_hidden_unit

FIX : We need to see unit line on PDF even though it's an option

htdocs/core/lib/pdf.lib.php

@@ -1826,7 +1826,6 @@ function pdf_getlineunit($object, $i, $outputlangs, $hidedetails = 0, $hookmanag
 	}
 	if (empty($reshook))
 	{
-        if ($object->lines[$i]->special_code == 3) return '';
 	    if (empty($hidedetails) || $hidedetails > 1) $result.=$langs->transnoentitiesnoconv($object->lines[$i]->getLabelOfUnit('short'));
 	}
 	return $result;