Add fix to top_videos for empty database

src/invidious.cr

@@ -118,9 +118,13 @@ spawn do
     client = get_client(pool)
 
     args = [] of String
+    if top.size > 0
       (1..top.size).each { |i| args << "($#{i})," }
       args = args.join("")
       args = args.chomp(",")
+    else
+      next
+    end
 
     videos = [] of Video