D27873: sftp: do not show creation time when we do not know it

[Harald Sitter]

sitter created this revision.
sitter added a reviewer: ngraham.
Herald added projects: Dolphin, Frameworks.
Herald added subscribers: kfm-devel, kde-frameworks-devel.
sitter requested review of this revision.

REVISION SUMMARY
  creation time (aka birth time) is file system dependent, if the fs doesn't
  support it we seem to get createtime==0. skip over it when that is the
  case.
  
  BUG: 375305
  FIXED-IN: 20.04

TEST PLAN
  browsing a directory on btrfs over sftp doesn't show creation time as 1970

REPOSITORY
  R320 KIO Extras

BRANCH
  sftp-ctime

REVISION DETAIL
  https://phabricator.kde.org/D27873

AFFECTED FILES
  sftp/kio_sftp.cpp

To: sitter, ngraham
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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