add error view for bad request

lib/diskuy_web/controllers/fallback_controller.ex

@@ -28,4 +28,10 @@ defmodule DiskuyWeb.FallbackController do
     |> render(DiskuyWeb.ErrorView, :"401")
   end
 
+  def call(conn, {:error, :bad_request}) do
+    conn
+    |> put_status(:bad_request)
+    |> render(DiskuyWeb.ErrorView, :"400")
+  end
+
 end