D12919: [Plotter] Don't render if m_node is null

[Kai Uwe Broulik]

broulik created this revision.
broulik added a reviewer: Plasma.
Restricted Application added a project: Frameworks.
Restricted Application added a subscriber: kde-frameworks-devel.
broulik requested review of this revision.

REVISION SUMMARY
  `m_node` is deleted when window changes, we would access it inconditionally in `render`
  
  BUG: 394283

TEST PLAN
  Compiles.

REPOSITORY
  R296 KDeclarative

REVISION DETAIL
  https://phabricator.kde.org/D12919

AFFECTED FILES
  src/qmlcontrols/kquickcontrolsaddons/plotter.cpp

To: broulik, #plasma
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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