Bug 20691: (QA follow-up) Fix self-reg

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>

opac/opac-memberentry.pl

@@ -330,12 +330,14 @@ elsif ( $action eq 'edit' ) {    #Display logged in borrower's data
 
 my $captcha = random_string("CCCCC");
 my $patron_param = scalar Koha::Patrons->find( $borrowernumber );
+$template->param(
+    has_guarantor_flag => $patron_param->guarantor_relationships->guarantors->_resultset->count
+) if $patron_param;
 
 $template->param(
     captcha        => $captcha,
     captcha_digest => md5_base64($captcha),
-    patron         => $patron_param,
-    has_guarantor_flag => $patron_param->guarantor_relationships->guarantors->_resultset->count
+    patron         => $patron_param
 );
 
 output_html_with_http_headers $cgi, $cookie, $template->output, undef, { force_no_caching => 1 };