[5.0] Fix changelog parsing

[Fedik]

Pull Request for Issue #41635 and #41636.

Summary of Changes

Fix changelog parsing, that tries to create a non existing properties.

Testing Instructions

Please follow #41635

Actual result BEFORE applying this Pull Request

A deprecation warning

Expected result AFTER applying this Pull Request

No deprecation warning

Link to documentations

Please select:

• Documentation link for docs.joomla.org:
• No documentation changes for docs.joomla.org needed
• Pull Request link for manual.joomla.org:
• No documentation changes for manual.joomla.org needed

Reference:

• [4.0] Show changelog - GSoC Expand Extensions Manager #17536 redo #24026

[conseilgouz]

I have tested this item ✅ successfully on baca35d

Also tested it with Olivier's extension : https://extensions.joomla.org/extension/latest-news-enhanced/

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/41675.}

[HLeithner]

thanks @conseilgouz can you test this please (tomorrows nightly or latest commit build)?

[conseilgouz]

Just tested it : J 5 beta-2-dev nightly build 13 september 2023 00:27:40
Everything ok.