$wml = defined(%stores) ? (join "<br/>\n",map("<a href='$params{URL}/o
+p?optin&amp;store=$_'>$stores{$_}->{'store_t_address'}</a>" , keys %s
+tores) ):"Pas de résultat<br/><br/>" ;
[download]

Any reason for this convoluted code ? and would it not be nicer as :-

if (defined(%stores)) {
  my @param = map("<a href='$params{URL}/op?optin&amp;store=$_'>$store
+s{$_}->{'store_t_address'}</a>" , keys %stores)
  $wml = join "<br/>\n", @param;
} else {
  $wml = "Pas de résultat<br/><br/>";
}
[download]

Hope it helps
UnderMine