[4] webservices vs custom field list

[alikon]

trafficstars

Pull Request for Issue #38642 .

Summary of Changes

fixed

Testing Instructions

see #38642

Actual result BEFORE applying this Pull Request

500

Expected result AFTER applying this Pull Request

no error
and return the selected field list values

[hokislotdemo]

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[toivo]

I have tested this item :white_check_mark: successfully on 3bea502e631c5a5ebc161ee649e44e3ae5e441e3

Tested successfully in Joomla 4.2.3-dev of 5 September in Wampserver 3.2.9 and PHP 8.1.9.

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[Quy]

I don't know if it matters that the return format is different when no values.

Before PR (returns JSON):

            "myfields": {
                "": null
            },
            "radio": {
                "": null
            }

After PR (returns array):

            "myfields": [
                ""
            ],
            "radio": []

[toivo]

I have tested this item :white_check_mark: successfully on 3f2c307e581d25faa8aeec35b05db44ddc2f4083

Tested successfully in Joomla 4.2.9-rc2-dev of 13 March using PHP 8.1.10 and Postman v10.11.2

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[alikon]

conflict solved on #41777