the lobby is allowed to contain defunct links

lib/Properties.hs

@@ -702,7 +702,10 @@ unwrapURI sym p@(Property name _) f g = unwrapString p $ \link -> do
       setProperty name uri
       f uri
     Left NotALink -> unwrapPath link g
-    Left err -> complain $ case err of
+    Left err -> do
+      isLobby <- lintConfig configAssemblyTag <&> (== "lobby")
+
+      (if isLobby then warn else complain) $ case err of
         IsBlocked -> link <> " is a blocked site."
         DomainDoesNotExist domain -> "The domain " <> domain <> " does not exist; \
                                      \please make sure it is spelled correctly."