Validate vote title

views/votes_new.erb

@@ -1,5 +1,13 @@
 <h1 class="mb-5"><%= _("New vote") %></h1>
 
+<% if @errors %>
+<% @errors.each do |error| %>
+  <% if error.attribute == :title and error.type == :blank %>
+    <p class="alert alert-warning mb-4"><%= _("Enter a title.") %></p>
+  <% end %>
+<% end %>
+<% end %>
+
 <form action="/votes/new" method="post">
   <div class="mb-3">
     <label for="title" class="form-label"><%= _("Title") %></label>