1770 fix ajax http error

[gchi25]

PR Summary

This work fixes Ajax HTTP error in JSON file generating when creating new life event.

Related Github Issue

• Fixes #1770

Detailed Testing steps

To test in local development site or in dev site.

• [ ] Pull changes locally
• [ ] Make local development site up at http://localhost
• [ ] Navigate to add/bears_life_event to create a new life event
• [ ] Input Title: New Life Event
• [ ] Input ID: new_life_event
• [ ] Save as Draft
• [ ] Navigate to admin/content?combine=&type=bears_criteria&status=All&langcode=All
• [ ] Go to criteria "Applicant date of birth" edit page
• [ ] Edit title
• [ ] Save as Draft
• [ ] Verify the system generates JSON files successfully without Ajax HTTP error