D22786: KTar::openArchive: Don't assert if file has two root dirs

[David Faure]

dfaure accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R243 KArchive

BRANCH
  arcpatch-D22786

REVISION DETAIL
  https://phabricator.kde.org/D22786

To: aacid, apol, dfaure
Cc: dfaure, apol, kde-frameworks-devel, LeGast00n, sbergeron, michaelh, 
ngraham, bruns