Ajax forms fail with: missing-input-response

Problem/Motivation

This is more of a public service announcement but as I spent a good few hours looking into this wanted to share the knowledge.

If you're using an Ajax form and get errors about missing-input-response it needs be fixed upstream by #2755791: Ajax error ajax.$form.ajaxSubmit() is not a function.

Steps to reproduce

- Use an Ajax form

Proposed resolution

- Update code to check for new location of jquery.form.js

Remaining tasks

- None

User interface changes

- None

API changes

- None

Data model changes

- None