D8968: Prevent index out of range in case of empty or malformed filename

[Andreas Hartmetz]

ahartmetz added reviewers: KDE PIM, dvratil.

REPOSITORY
  R165 Akonadi

REVISION DETAIL
  https://phabricator.kde.org/D8968

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