Handle 404 stuff better for thread.by_id

lib/PostText/Controller/Thread.pm

@@ -62,7 +62,8 @@ sub by_id($self) {
     }
     else {
         $self->stash(
-            thread => [],
+            thread  => {},
+            remarks => [],
             status  => 404
             )
     }

t/thread.t

@@ -36,6 +36,9 @@ subtest 'View single thread', sub {
 
     $t->get_ok('/thread/single/1/1')->status_is(200)
         ->text_like(h2 => qr/Thread #1/);
+
+    $t->get_ok('/thread/single/65536')->status_is(404)
+        ->text_like(h2 => qr/Thread #/);
 };
 
 subtest 'Threads feed', sub {