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

[David Faure]

dfaure created this revision.
dfaure added a reviewer: smartins.
Restricted Application added a project: KDE PIM.
Restricted Application added a subscriber: KDE PIM.
dfaure requested review of this revision.

REVISION SUMMARY
  Enabling a calendar with todos crashed for me.
  Apparently because of missing parent todos.

REPOSITORY
  R76 PIM: Event Views

BRANCH
  Applications/17.12

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

AFFECTED FILES
  src/todo/incidencetreemodel.cpp

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