[5.3] Changes unneeded null check to ?? operator for libraries

[joomdonation]

Pull Request for Issue # .

Summary of Changes

This PR uses TernaryToNullCoalescingRector rector rule to change unneeded null check to ?? operator for our libraries code. This is done automatically by rector, no manual change included.

Testing Instructions

Code review

Actual result BEFORE applying this Pull Request

Works

Expected result AFTER applying this Pull Request

Works, with cleaner, easier to read code

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

[QuyTon]

I have tested this item ✅ successfully on 4bcbab0

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[viocassel]

I have tested this item ✅ successfully on 4bcbab0

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/44918.}

[alikon]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/44918.}

[HLeithner]

Code Review

[HLeithner]

thanks