Handle channels with empty home pages

src/invidious/routes/channels.cr

@@ -10,7 +10,7 @@ module Invidious::Routes::Channels
     items = fetch_channel_home(ucid, channel)
 
     has_trailer = false
-    if items[0].is_a? Video
+    if !items.empty? && items[0].is_a? Video
       has_trailer = true
     end
 

src/invidious/views/channel/home.ecr

@@ -57,4 +57,10 @@
             </div>
         <% end %>
     <% end %>
+
+    <% if items.size == 0 %>
+        <h3 class="pure-u-1 h-box">
+            <%= translate(locale, "This channel doesn't have any content.")%>
+        </h3>
+    <% end %>
  </div>