Fix copy timeline modal actions

app/assets/javascripts/avalon_timelines/timelines.js.coffee

@@ -1,11 +1,11 @@
 # Copyright 2011-2023, The Trustees of Indiana University and Northwestern
 # University. Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
-# 
+#
 # You may obtain a copy of the License at
-# 
+#
 # http://www.apache.org/licenses/LICENSE-2.0
-# 
+#
 # Unless required by applicable law or agreed to in writing, software distributed
 # under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
 # CONDITIONS OF ANY KIND, either express or implied. See the License for the
@@ -66,11 +66,11 @@ $('#copy-timeline-form').submit(
 
 $('#copy-timeline-form').bind('ajax:success',
  (event, data, status, xhr) ->
- if (data.errors)
+ if (data?.errors)
  console.log(data.errors.title[0])
  else
  if (submit_edit)
- window.location.href = data.path
+ window.location.href = event.detail[0].path
  else
  if ( $('#with_refresh').val() )
  location.reload()