D4999: [FrameSvg] Ensure prefix list is never empty

[Kai Uwe Broulik]

broulik created this revision.
Restricted Application added projects: Plasma, Frameworks.
Restricted Application added subscribers: Frameworks, plasma-devel.

REVISION SUMMARY
  When setting an empty QStringList as prefix, it can lead to unexpected results, such as the prefix not changing.
  
  BUG: 377441

TEST PLAN
  See https://phabricator.kde.org/D4998 which shows a place where this happened

REPOSITORY
  R242 Plasma Framework (Library)

REVISION DETAIL
  https://phabricator.kde.org/D4999

AFFECTED FILES
  src/declarativeimports/core/framesvgitem.cpp

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