TwitterAPI: Return proper error.

Fixes #32.

lib/pleroma/web/twitter_api/twitter_api_controller.ex

@@ -211,6 +211,11 @@ def external_profile(%{assigns: %{user: current_user}} = conn, %{"profileurl" =>
          response <- Poison.encode!(user_map) do
       conn
       |> json_reply(200, response)
+    else
+      _e ->
+        conn
+        |> put_status(404)
+        |> json(%{error: "Can't find user"})
     end
   end
 

lib/pleroma/web/web_finger/web_finger.ex

@@ -105,13 +105,10 @@ def finger(account) do
                URI.parse(account).host
              end
 
-    {:ok, template} = find_lrdd_template(domain)
-
-    address = String.replace(template, "{uri}", URI.encode(account))
-
-    response = @httpoison.get(address, ["Accept": "application/xrd+xml"])
-
-    with {:ok, %{status_code: status_code, body: body}} when status_code in 200..299 <- response,
+    with {:ok, template} <- find_lrdd_template(domain),
+         address <- String.replace(template, "{uri}", URI.encode(account)),
+         response <- @httpoison.get(address, ["Accept": "application/xrd+xml"]),
+         {:ok, %{status_code: status_code, body: body}} when status_code in 200..299 <- response,
          doc when doc != :error<- XML.parse_document(body),
          {:ok, data} <- webfinger_from_xml(doc) do
       {:ok, data}