Fixes to avoid a warning when IBAN is null, in look and redirection

templates/debit/list.html.ep

@@ -1,5 +1,6 @@
 % title 'Outcome of ' . $account;
 
+<a class="add-item-btn" href="/<%= $account %>/out"><img src="/add-debit.svg" class="icon" alt=""> Add debit</a>
 <p>Listed in reverse order:</p>
 
 <table class="income">

templates/debit/upsert.html.ep

@@ -1,7 +1,7 @@
 % my $id = stash 'id';
 % title $id ? "Change debit $id" : "Enter new debit";
 
-<form method="post">
+<form action="<%= url_for %>" method="post">
 <h2>Essentials</h2>
 
 % my %r;