D9264: ErrorOverlay: don't show by mistake if called with Running twice.

[David Faure]

dfaure closed this revision.

REPOSITORY
  R165 Akonadi

REVISION DETAIL
  https://phabricator.kde.org/D9264

To: dfaure, dvratil, vkrause
Cc: #kde_pim, dvasin, winterz, vkrause, mlaurent, knauss, dvratil
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