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

[Matthieu Gallien]

mgallien added inline comments.

INLINE COMMENTS

> anthonyfieroni wrote in extractor.cpp:34
> d *should* never be nullptr

If the Extractor is built using the move constructor, the other instance will have a null d pointer. As far as I know, this is standard practice.

REPOSITORY
  R286 KFileMetaData

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

To: mgallien, #frameworks
Cc: dfaure, anthonyfieroni
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