Show the notification about previous submissions should not check for source_entity

Rolling new patch of #12 for 6.2.0-rc1

I'm getting the same error message when I try to download a submission as PDF.
"The website encountered an unexpected error. Please try again later."
I've made a VERY basic webform, so I don't understand why I'm having this issue. Can anyone help?

@odaemilie There will be an underlying error message either in the Drupal error report or in the web server logs. You can try that patch to see if it is the same problem.

Liam, I am fairly new to this and don't really know what you mean when you say web server logs. How do I find the drupal error report or the web server logs?

For Drupal logs, when you are logged-in as the administrator, there will be a "Reports" tab and under that "Recent log messages"; it is at path admin/reports/dblog (dblog module must be enabled).

The web server logs are wherever your web server is configured to put them, such as /var/log/apache2.