[Differential] [Commandeered] D789: Make sure we don't crash when not using a filter

[kfunk (Kevin Funk)]

kfunk commandeered this revision.
kfunk edited reviewers, added: apol; removed: kfunk.

REPOSITORY
  rKDEVPLATFORM KDevPlatform

REVISION DETAIL
  https://phabricator.kde.org/D789

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To: kfunk, apol
Cc: kdevelop-devel