Error in log file after submitting form

Description

Steps to reproduce:

1. Create a page called "Page 1" in "en-US" (do NOT create a version for that page in "en").
2. Create a form in "en-US" called "Form 1".
3. Add a text element to Form 1 and mark it as required.
4. Add Form 1 to Page 1.
5. Open Page 1 in a browser (en-US version); TURN OFF Javascript in that browser.
6. Submit the form.

Expected:
The error (described below under 'Actual') should not appear in the log file.

Actual:
An error message in the log file:
Element '<element_id>' not found or the Form has not been re-published after was changed.