D17617: Display error instead of silently failing when asked to create folder that already exists

[David Faure]

dfaure accepted this revision.

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D17617

To: ngraham, #dolphin, elvisangelaccio, dfaure
Cc: dfaure, emateli, elvisangelaccio, Codezela, kde-frameworks-devel, michaelh, ngraham, bruns
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