[Differential] [Request, 4 lines] D1532: validate the config before checking if it can be applied

[sebas (Sebastian Kügler)]

sebas created this revision.
sebas added a reviewer: Plasma.
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Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  canBeApplied is public API, it shouldn't blow up when passed an invalid
  config, but indicate (correctly!) that this "config" can't be applied.
  
  This is called a bit carelessly from the kded daemon. I've fixed it
  there as well, but it seems prudent to also make sure in libkscreen that
  the user doesn't do stupid things.
  
  CCBUG:362586

TEST PLAN
  autotests pass

REPOSITORY
  rLIBKSCREEN KScreen Library

BRANCH
  sebas/guardcanbeapplied

REVISION DETAIL
  https://phabricator.kde.org/D1532

AFFECTED FILES
  src/config.cpp

EMAIL PREFERENCES
  https://phabricator.kde.org/settings/panel/emailpreferences/

To: sebas, Plasma
Cc: plasma-devel, sebas
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