"multiple" option for MaterialChoiceTableType doesn't work #39273

Prerequisites

• I understand and accept the project's code of conduct.
• I have already searched in existing issues and found no previous report of this bug.

Describe the bug and add attachments

Hello,

The documentation (https://devdocs.prestashop-project.org/9/development/components/form/types-reference/material-choice-table/#body-inner) says that we can use multiple option "to enable multiple checkboxes selection or not".

But in fact, using the "multiple => false" option generate a fatal error in MaterialChoiceTableType

count(): Argument #1 ($value) must be of type Countable|array, string given

I have succeded to fix it with a small change in MaterialChoiceTableType but I don't think we should.

If we don't want multiple option, we must use ChoiceType : better UI, no "Select All", radios instead of checkboxes.

I think we should remove this option, PrestaShop never use it.

What do you think about it ? :)

Thank you

Expected behavior

We should have a checklist where we can only select one checkbox

Steps to reproduce

1. Update CustomerType
2. Add 'multiple' => false for the MaterialChoiceTableType group_ids
3. Edit a customer

PrestaShop version(s) where the bug happened

8.2.1 (and probably before), 9.0.0

How you installed PrestaShop

git clone

PHP version(s) where the bug happened

8.1

If your bug is related to a module, specify its name and its version

No response

Your company or customer's name goes here (if applicable).

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