D14751: [Shell Corona] Don't create ScriptingEngine if there are no update scripts

[Kai Uwe Broulik]

broulik created this revision.
broulik added reviewers: Plasma, mart.
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REVISION SUMMARY
  It takes almost 30ms here to create the engine and then we usually don't end up using it as all update scripts had already been processed in the past.

TEST PLAN
  - Update script is still processed if not in "performed" list

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D14751

AFFECTED FILES
  shell/shellcorona.cpp

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