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

[Matthieu Gallien]

mgallien created this revision.
Restricted Application added a project: Frameworks.

REVISION SUMMARY
  fix crash when more than one instances of ExtractorCollection are destructed

TEST PLAN
  without the modification to Extractor class, the new test fails. With the fix, valgrind does not report any new memory leak

REPOSITORY
  R286 KFileMetaData

BRANCH
  fixPluginDelete

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

AFFECTED FILES
  autotests/extractorcollectiontest.cpp
  src/extractor.cpp

To: mgallien, #frameworks
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