D8852: Fix crash deep inside VcsOverlayProxyModel::data()

[Kevin Funk]

kfunk added a subscriber: dfaure.

REPOSITORY
  R32 KDevelop

REVISION DETAIL
  https://phabricator.kde.org/D8852

To: kfunk, apol
Cc: dfaure, brauch, apol, kdevelop-devel
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