D20260: Fix crash in KArchive::findOrCreate with broken files

[Albert Astals Cid]

aacid created this revision.
Herald added a project: Frameworks.
Herald added a subscriber: kde-frameworks-devel.
aacid requested review of this revision.

REVISION SUMMARY
  In some occassions KArchive::findOrCreate calls itself to find the parent KArchiveDirectory
  
  Since KArchive::findOrCreate can return null we have to take into account parent can be null.

TEST PLAN
  Crashy .zip doesn't crash anymore

REPOSITORY
  R243 KArchive

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D20260

AFFECTED FILES
  src/karchive.cpp

To: aacid
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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