Add message for when channel has no posts

locales/en-US.json

@@ -496,5 +496,6 @@
     "toggle_theme": "Toggle Theme",
     "carousel_slide": "Slide {{current}} of {{total}}",
     "carousel_skip": "Skip the Carousel",
-    "carousel_go_to": "Go to slide `x`"
+    "carousel_go_to": "Go to slide `x`",
+    "channel_has_no_posts": "This channel hasn't posted yet"
 }

src/invidious/views/community.ecr

@@ -25,6 +25,10 @@
     <div class="h-box">
         <p><%= error_message %></p>
     </div>
+<% elsif items.not_nil!["comments"].as_a.empty? %>
+    <div class="h-box">
+        <%= translate(locale, "channel_has_no_posts") %>
+    </div>
 <% else %>
     <div class="h-box pure-g comments" id="comments">
         <%= IV::Frontend::Comments.template_youtube(items.not_nil!, locale, thin_mode) %>