Bug: Issue with array schema defaults not applying properly when formData is an empty array

[abdalla-rko]

Reasons for making this change

Fixes #4335

when you enable the mergeExtraDefaults and you have formData as an empty array, the default on the root of the array schema doesn't get applied and only applies the default from the items property. If formData is undefined or null, it will apply the default from the root schema and items.default and the root default will take precedence over item property default.

Checklist

• I'm adding or updating code
  • I've added and/or updated tests. I've run npx nx run-many --target=build --exclude=@rjsf/docs && npm run test:update to update snapshots, if needed.
  • I've updated docs if needed
  • I've updated the changelog with a

[heath-freenome]

consider doing this?:

Suggested change

	const arrayMinItemsStateBehavior = experimental_defaultFormStateBehavior?.arrayMinItems;
	const arrayMinItemsPopulate = arrayMinItemsStateBehavior?.populate;
	const arrayMergeExtraDefaults = arrayMinItemsStateBehavior?.mergeExtraDefaults;
	const { arrayMinItems: arrayMinItemsStateBehavior = {} } = experimental_defaultFormStateBehavior;
	const { populate: arrayMinItemsPopulate, mergeExtraDefaults: arrayMergeExtraDefaults } = arrayMinItemsStateBehavior;

[abdalla-rko]

It's not possible to destructure experimental_defaultFormStateBehavior since it can be undefined but I improved it a little.

[heath-freenome]

Also, would you be willing to change the example for these docs to switch arrayMinItems to be emptyObjectFields?

[heath-freenome]

@abdalla-rko Have you had the change to consider my feedback/request yet?