Resizing loop : lose every missing response

[QRuhier]

Describe the bug

When we resize a loop (adding/deleting an iteration) , the remaining iterations keep there values, except their missing values

• [x] I tested it on the storybook, which leads me to believe that it's a lunatic bug.

To Reproduce

Steps to reproduce the behavior:

1. questionnaire : issue_1045.json
2. page 2 : set 1 person
3. page 3, 4.1, 4.2 : give answer, then missing, then answer (whatever the order, it's just to have both for seing problem)
4. go back to page 2 : change to 2 persons
5. go back to the loop for your 1st person : the answers you gave remain 👍 but missings values have disappeared 👎

It is the same if for example you had 3 iterations then changed to 2 : the missings for the 2 remaining iterations disappear

Expected behavior

When resizing a loop, the remaining iterations should keep their answers, including missing responses

Version where the bug appeared

Observed on 3.1.0, but was already on 2.7

Browser where the bug was tested

• [ ] Chrome
• [x] Firefox
• [ ] Safari
• [ ] Edge
• [ ] Other (please specify): **___**

Additional context

Add any other context about the problem here.

[Grafikart]

Le comportement est "normal" au vu du code :

• Le resizing vient modifier la valeur de T_AN, et lui assigne sa nouvelle valeur (un tableau de taille 2)
• La valeur de T_AN étant modifier missingBlock détecte qu'il faut donc établir la valeur de T_AN_MISSING a null en suivant la taille de T_AN. Donc T_AN_MISSING obtient la valeur [null, null].

Pour améliorer ce comportement une solution serait lors d'un resizing vers une valeur plus grande de ne pas changer directement la variable (ici T_AN) mais plutôt de définir une nouvelle valeur a un nouvel index. Cela implique donc de changer le comportement du resizing (à voir si c'est satisfaisant ou pas)