D27835: sftp: fix free space query for urls with empty path

[Méven Car]

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

REPOSITORY
  R320 KIO Extras

BRANCH
  sftp-free-path

REVISION DETAIL
  https://phabricator.kde.org/D27835

To: sitter, ngraham, meven
Cc: kde-frameworks-devel, kfm-devel, pberestov, iasensio, fprice, LeGast00n, cblack, MrPepe, fbampaloukas, alexde, GB_2, Codezela, feverfew, meven, michaelh, spoorun, navarromorales, firef, ngraham, andrebarros, bruns, emmanuelp, mikesomov
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