D21989: Don't show error message if sharing is cancelled by the user

[Aleix Pol Gonzalez]

apol accepted this revision.

REPOSITORY
  R495 Purpose Library

BRANCH
  noerror

REVISION DETAIL
  https://phabricator.kde.org/D21989

To: nicolasfella, apol, ngraham
Cc: broulik, kde-frameworks-devel, LeGast00n, michaelh, ngraham, bruns
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