D29213: Status bar: display no text when no free space size in unkwown

[Méven Car]

meven added reviewers: VDG, elvisangelaccio.

REPOSITORY
  R318 Dolphin

REVISION DETAIL
  https://phabricator.kde.org/D29213

To: meven, #dolphin, ngraham, broulik, #vdg, elvisangelaccio
Cc: elvisangelaccio, kfm-devel, waitquietly, azyx, nikolaik, pberestov, iasensio, aprcela, fprice, fbampaloukas, alexde, Codezela, feverfew, meven, spoorun, navarromorales, firef, ngraham, andrebarros, emmanuelp, rdieter, mikesomov
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