Remove extra 'next page' button at then end of a playlist

src/invidious/routes/playlists.cr

@@ -433,6 +433,13 @@ class Invidious::Routes::Playlists < Invidious::Routes::BaseRoute
       return error_template(500, ex)
     end
 
+    page_count = (playlist.video_count / 100).to_i
+    page_count = 1 if page_count == 0
+
+    if page > page_count
+      return env.redirect "/playlist?list=#{plid}&page=#{page_count}"
+    end
+
     if playlist.privacy == PlaylistPrivacy::Private && playlist.author != user.try &.email
       return error_template(403, "This playlist is private.")
     end

src/invidious/views/playlist.ecr

@@ -103,7 +103,7 @@
     </div>
     <div class="pure-u-1 pure-u-lg-3-5"></div>
     <div class="pure-u-1 pure-u-lg-1-5" style="text-align:right">
-        <% if videos.size == 100 %>
+        <% if page_count != 1 && page < page_count %>
             <a href="/playlist?list=<%= playlist.id %>&page=<%= page + 1 %>">
                 <%= translate(locale, "Next page") %>
             </a>