D21200: FrameSvg: prevent crash when calling mask() with no frame yet created

[Friedrich W. H. Kossebau]

kossebau created this revision.
kossebau added a reviewer: Plasma.
Herald added a project: Frameworks.
Herald added a subscriber: kde-frameworks-devel.
kossebau requested review of this revision.

REPOSITORY
  R242 Plasma Framework (Library)

BRANCH
  donotcrashformask

REVISION DETAIL
  https://phabricator.kde.org/D21200

AFFECTED FILES
  src/plasma/framesvg.cpp

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