D11517: Fix crash when comparing nodes with depth of -1

[David Faure]

dfaure closed this revision.

REPOSITORY
  R76 PIM: Event Views

REVISION DETAIL
  https://phabricator.kde.org/D11517

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