Notice: Undefined variable: destination in webform_webform_submission_actions()

In the most recent 3.9 version of webform (and in master), there's a little bug that shows up only when you have the print_pdf module enabled. Here's how to reproduce:

1. Enable webform and print_pdf modules.
2. Create a webform node.
3. Fill out the webform, and submit the results.
4. View the webform, click on the results tab.
5. Click the view link to the right of the submission you just did.

You'll get this error:
Notice: Undefined variable: destination in webform_webform_submission_actions() (line 822 of /var/www/drupal-7.x-dev/sites/all/modules/contrib/webform/webform.module).

I took a guess at what the intention was, and attached it to this issue.