MultiSelect: it doesn't understand any 'optionGroupChildren' value except the 'items'

[dominikj111]

Describe the bug

When the other than on web site optionGroupChildren value is used, the component doesn't understand the groups.

Reproducer

https://stackblitz.com/edit/pgy6prlk?file=src%2FApp.jsx

System Information

react: 18.3.1
primereact: 10.9.2

Steps to reproduce the behavior

1. go to an example and edit on StackBlitz
2. rename the "optionGroupChildren" value and related arrays

Expected behavior

As presented on the web site.

[dominikj111]

@KumJungMin FYI as it looks related to #7595

[KumJungMin]

• Thank you for reporting this issue! 🙂 (fix(multiSelect): group select items using the getOptionGroupChildren prop #7661) @dominikj111
• I have submitted a PR and updated the code to cover the following cases (Standard Action: v10.9.1):

1. Options are grouped using `props.optionGroupChildren` (but `props.optionGroupLabel` is required).
2. If an option has an unmatched object key, the item remains invisible.
  - In v10.9.1, when there are no items under a group, only the group title is displayed.
  - I have adjusted the implementation to maintain this behavior.