Fix PHP 8 deprecated warnings #3947
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Adding null-coalescing operator to avoid str_replace(): Passing null to parameter dokuwiki#3 ($subject) of type array|string is deprecated
Fixes Creation of dynamic property _HWLDF_WordAccumulator::$_lines / $_line / $_group / $_tag is deprecated in ./inc/DifferenceEngine.php on line 936 And proactively caught another bunch in _Diff3_Op class (not reported in unit tests)
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