D7750: fix crash when more than one instances of ExtractorCollection are destructed

[Matthieu Gallien]

This revision was automatically updated to reflect the committed changes.
Closed by commit R286:b53a72743601: fix crash when more than one instances of ExtractorCollection are destructed (authored by mgallien).

REPOSITORY
  R286 KFileMetaData

CHANGES SINCE LAST UPDATE
  https://phabricator.kde.org/D7750?vs=20200&id=20259

REVISION DETAIL
  https://phabricator.kde.org/D7750

AFFECTED FILES
  autotests/extractorcollectiontest.cpp
  src/extractor.cpp
  src/extractor.h
  src/extractor_p.h
  src/extractorcollection.cpp

To: mgallien, #frameworks, dfaure
Cc: dfaure, anthonyfieroni
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