TYPO3 Core

When using the section feature of FlexForm, and empting a section, the result parsed flexform will contain an empty string instead of an empty array.
This behaviour existed before the introduction of FlexFormService.

To reproduce, a contributor must remove all elements in a flexform section and save. The flexform will then contain:

                <field index="my_field">
                    <el index="el"></el>
                </field>

In EXT:core/Classes/Service/FlexFormService.phpL49, when discovering a node named el, the parser is recursively called. When $nodeValue is an empty string, it should return an empty array. Not doing so force developers to test again empty, which can not always be done straightforwardly. It is expected to be able to test with count().

I attached an example flexform to test with.