D9504: Show that the last check failed if no updates available

[Fabian Vogt]

fvogt created this revision.
fvogt added reviewers: lukas, jgrulich.

REVISION SUMMARY
  If the last check for updates failed, it would be misleading to show that
  no updates are available.

TEST PLAN
  Ran pkupdates while YaST is open, instead of (incorrectly) showing
  that no updates are available, it shows that the last check failed.

REPOSITORY
  R623 Plasma PackageKit Updater

BRANCH
  fixes

REVISION DETAIL
  https://phabricator.kde.org/D9504

AFFECTED FILES
  src/declarative/pkupdates.cpp
  src/declarative/pkupdates.h

To: fvogt, lukas, jgrulich
Cc: plasma-devel
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