[Differential] [Request, 4 lines] D3314: Properly test environment variable

[apol (Aleix Pol Gonzalez)]

apol created this revision.
apol added a reviewer: Frameworks.

REVISION SUMMARY
  use qEnvironmentVariableIsSet instead of qgetenv().isEmpty()

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D3314

AFFECTED FILES
  src/core/ksharedconfig.cpp

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To: apol, #frameworks
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