D28972: FileMetaDataWidget: Avoid displaying size and dates fields when they have no value

[Méven Car]

meven created this revision.
meven added reviewers: Dolphin, ngraham.
Herald added a project: Baloo.
Herald added a subscriber: Baloo.
meven requested review of this revision.

REVISION SUMMARY
  CCBUG: 413091
  More precisely https://bugs.kde.org/show_bug.cgi?id=413091#c7

TEST PLAN
  Open remote:/ in Dolphin:
  Size, Access and modification dates fields are not visible

REPOSITORY
  R824 Baloo Widgets

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D28972

AFFECTED FILES
  src/filemetadataprovider.cpp

To: meven, #dolphin, ngraham
Cc: #baloo, hurikhan77, lots0logs, fbampaloukas, domson, ashaposhnikov, astippich, spoorun, ngraham, abrahams
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