Merge branch 'pr/3908'

Merge branch 'pr/3908'

* pr/3908:
  JPEGMeta: clean up exception handling
  Fix: Do not garbage collect the JpegMeta object after reading a tag
  Replace check for null with cast to string
  Fix: Rework error handling in JpegMeta marker reading
  Replace is_null() check with count()
  Fix: Padding in _getFixedString, log the path of damaged images
  Fix: PHP8-related JpegMeta.php fixes
  Backwards Compatibility: Don't error if finishSectionEdit is called without first startSectionEdit
  Fix: 'E_WARNING: Uninitialized string offset -1' on some templates
  Fix: 'E_WARNING: Undefined array key "_data"'