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

[Aleix Pol Gonzalez]

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

REPOSITORY
  R243 KArchive

BRANCH
  master

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

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