D12000: [ProcessModel] Return invalid QVariant() for when window is not known

[Kai Uwe Broulik]

broulik created this revision.
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REVISION SUMMARY
  This communicates "unknown" better than a zero. The KSysGuardProcessList also seems to expect this.

TEST PLAN
  I no longer get a non-working "Show Application Window" in context menu for processes that don't have a window associated with them.

REPOSITORY
  R111 KSysguard Library

REVISION DETAIL
  https://phabricator.kde.org/D12000

AFFECTED FILES
  processui/ProcessModel.cpp

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