[MDL-54986] Clicking 'Add' under a question in a quiz with attempts results in a JS 'Uncaught TypeError' - Moodle Tracker

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Testing Instructions:

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1. As an admin, create a new quiz and add a single question
2. As a student, attempt the quiz
3. As an admin, edit the quiz ('Admin' block > 'Quiz admin' > 'Edit quiz').
4. Check clicking the 'Add' link under the question is possible, but the link is dimmed and does nothing. Open the browser console. Click on the Add link again and check there are no JavaScript errors.

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1. As an admin, create a new quiz and add a single question 2. As a student, attempt the quiz 3. As an admin, edit the quiz ('Admin' block > 'Quiz admin' > 'Edit quiz'). 4. Check clicking the 'Add' link under the question is possible, but the link is dimmed and does nothing. Open the browser console. Click on the Add link again and check there are no JavaScript errors.
Difficulty:
Easy
Affected Branches:
MOODLE_30_STABLE, MOODLE_31_STABLE
Fixed Branches:
MOODLE_30_STABLE, MOODLE_31_STABLE
Pull from Repository:
https://github.com/Beedell/moodle.git
Pull Master Branch:
wip-~~MDL-54986~~-master
Pull Master Diff URL:
https://github.com/Beedell/moodle/compare/master...Beedell:wip-MDL-54986-master

As an admin, create a new quiz and add a single question
As a student, attempt the quiz
As an admin, edit the quiz ('Admin' block > 'Quiz admin' > 'Edit quiz'). Open the browser console now.
Click the 'Add' link under the question. You will see an error in the console:
Uncaught TypeError: Cannot read property 'focus' of null

Discovered while testing

MDL-54778 JS error in the form.js: TypeError: names[name].push is not a function

Testing discovered

MDL-56791 Edit quiz page allows the cmid of a non-quiz module