Disable language filtering when there is no key

src/helpers.cr

@@ -25,7 +25,7 @@ class Config
       dbname: String,
     ),
     redirect:   Bool,
-    dl_api_key: String | Nil,
+    dl_api_key: String?,
   })
 end
 

src/invidious.cr

@@ -140,10 +140,13 @@ spawn do
     DetectLanguage.configure do |config|
       config.api_key = CONFIG.dl_api_key.not_nil!
     end
+    filter = true
+  else
+    filter = false
   end
 
   loop do
-    top = rank_videos(PG_DB, 40, youtube_pool, true)
+    top = rank_videos(PG_DB, 40, youtube_pool, filter)
 
     if top.size > 0
       args = arg_array(top)