Just respond with an empty body on PUT requests

lib/remote_storage/riak.rb

@@ -78,6 +78,8 @@ module RemoteStorage
       object.reload
       timestamp = object.last_modified.to_i
       update_all_directory_objects(user, directory, timestamp)
+
+      halt 200
     rescue ::Riak::HTTPFailedRequest
       halt 422
     end

spec/riak_spec.rb

@@ -84,6 +84,7 @@ describe "App with Riak backend" do
 
         it "saves the value" do
           last_response.status.must_equal 200
+          last_response.body.must_equal ""
           data_bucket.get("jimmy:documents:bar").data.must_equal "another text"
         end