D7538: [MPris Engine] Don't construct QDBusObjectPath in Metadata update

[Kai Uwe Broulik]

broulik created this revision.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  Creating one from an empty string prints a warning and here we don't actually need a fully-fledged QDBusObjectPath, we can just compare strings.
  
  BUG: 383557

TEST PLAN
  I tested with vlc and plasma-browser-integration and neither of them actually sets mpris:trackid but the warning is gone now

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D7538

AFFECTED FILES
  dataengines/mpris2/playercontainer.cpp

To: broulik, #plasma
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart, lukas
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